just browsed the net and found this.....and it states W126 for this wheel size, there are some 18" RS's that fit the 500E.
RS001 7 x 15 25.0 100.00 4 57.0 BMW,VW 3/1,3/R,Golf II
RS002 8 x 15 12.0 100.00 4 57.0 BMW 3/1
RS003 7 x 16 25.0 100.00 4 57.0 BMW,VW 3/1,3/R,Golf II
RS004 8 x 16 12.0 100.00 4 57.0 BMW 3/1
RS005 7 x 16 11.0 120.00 5 72.5 BMW 5/1,5/H,6Cs/1,7,7/1
RS008 7 x 16 24.0 112.00 5 66.5 MB 116,123,124,126,201
RS009 8 x 16 11.0 112.00 5 66.5 MB 107,116,123,126
RS012 7 x 16 23.0 130.00 5 71.6 Porsche 911,930,944 bis 8/86
RS013 8 x 16 11.0 130.00 5 71.6 Porsche 911,930,944 bis 8/86
RS014 9 x 16 11.0 130.00 5 71.6 Porsche 911,930,944 bis 8/86
RS016 6 1/2 x 15 32.0 100.00 4 57.0 VW Golf,Scirocco,Passat
RS017 8 x 16 62.0 130.00 5 71.6 Porsche 928 VA bis Bj.8/85
RS018 9 x 16 36.0 130.00 5 71.6 Porsche 928 HA
RS020 7 1/2 x 16 30.0 120.65 5 73.9 Jaguar XJ,XJS,XJ40
RS021 8 x 16 11.0 120.00 5 72.5 BMW 5/1,5/H,6Cs/1,7,7/1
RS022 9 x 16 24.0 120.00 5 72.5 BMW 5/1,5/H,6Cs/1,7/1,M3
RS023 8 x 16 24.0 112.00 5 66.5 MB 116,123,126,201 HA
RS025 9 x 16 36.0 120.65 5 70.3 Chevrolet Corvette VA
RS026 10 x 16 36.0 120.65 5 70.3 Chevrolet Corvette HA
RS027 8 1/2 x 16 30.0 120.65 5 73.9 Jaguar HA XJ,XJS,XJ40
RS028 7 x 16 11.0 108.00 5 58.0 Ferrari VA 308,328
RS029 8 x 16 -2.0 108.00 5 67.0 Ferrari HA 308,328
RS055 9 x 16 15.0 130.00 5 71.6 Porsche 911,930,944
RS056 8 x 16 28.0 130.00 5 71.6 Porsche 911,930,944
RS057 10 x 16 23.0 130.00 5 71.6 Porsche 911,930,944
RS058 10 x 16 11.0 112.00 5 66.5 MB 107,123,126 HA
RS059 10 x 16 11.0 130.00 5 71.6 Porsche 928 HA
RS060 7 x 16 35.0 108.00 4 63.5 Ford Sierra,Sierra 4x4
RS061 8 x 16 20.0 120.00 5 72.5 BMW M3,M5,5/1,6Cs,7,7/1
RS063 9 x 16 11.0 112.00 5 57.0 Audi
RS064 7 x 15 37.0 112.00 5 57.0 Audi 100,200,100 Q,200 Q
RS065 8 x 15 24.0 112.00 5 57.0 Audi 100 Q,200 Q,Quattro
RS066 10 x 16 20.0 120.00 5 72.5 BMW 7,7/1 HA
RS068 7 x 15 0.0 98.00 4 58.5 Maserati Biturbo VA
RS069 8 x 15 12.0 98.00 4 58.5 Maserati Biturbo HA
RS070 7 x 15 16.0 100.00 4 57.0 BMW 3/1,3/R
RS071 8 x 15 18.0 100.00 4 57.0 BMW 3/1,3/R HA
RS072 9 x 15 3.0 100.00 4 57.0 BMW 3/1 HA
RS073 8 x 16 15.0 100.00 4 57.0 BMW 3/1
RS074 9 x 16 0.0 100.00 4 57.0 BMW 3/1
RS076 10 x 16 11.0 120.00 5 72.5 BMW 6CS/1,7
RS077 8 x 16 35.0 112.00 5 66.5 MB 124,201
RS078 9 x 16 11.0 112.00 5 66.5 MB 107,123,126
RS079 10 x 16 -2.0 112.00 5 66.5 MB 126
RS080 9 x 15 28.0 130.00 5 71.6 Porsche 911,930,944
RS081 11 x 15 28.0 130.00 5 71.6 Porsche 911,930,944
RS082 9 x 15 2.0 130.00 5 71.6 Porsche 911,930,944
RS083 13 x 15 -49.0 130.00 5 71.6 Porsche 911,930,944
RS084 8 x 15 -1.0 108.00 5 58.0 Ferrari 308 VA
RS085 11 x 15 -39.0 108.00 5 67.0 Ferrari 308 HA
RS086 9 x 15 4.0 108.00 0 71.0 Ferrari 512 VA
RS087 13 x 15 -47.0 108.00 0 71.0 Ferrari 512 HA
RS088 9 x 15 6.0 112.00 5 66.5 MB 107,126 VA
RS089 13 x 15 -58.0 112.00 5 66.5 MB 107,126 HA
RS091 8 1/2 x 15 3.0 120.65 5 73.9 Jaguar XJ,XJS
RS092 11 x 15 -66.0 120.65 5 73.9 Jaguar XJ,XJS
RS093 8 x 15 12.0 112.00 5 66.5 MB 201
RS094 8 x 16 36.0 108.00 4 63.5 Ford Sierra,Sierra 4x4
RS095 8 x 16 11.0 114.30 4 60.2 Toyota Celica,Supra
RS096 7 x 15 38.0 100.00 4 61.0 Renault Alpine GTA
RS097 8 1/2 x 15 18.0 100.00 4 61.0 Renault Alpine
RS098 7 x 16 35.0 112.00 5 66.5 MB 124,201
RS099 8 x 15 12.0 100.00 4 57.0 Opel GT VA
RS100 9 x 15 3.0 100.00 4 57.0 Opel GT HA
RS102 10 x 15 -7.0 112.00 5 66.5 MB 107,116
RS103 7 1/2 x 16 4.0 108.00 4 63.5 Ford Sierra VA
RS104 9 x 16 11.0 108.00 4 63.5 Ford Sierra HA
RS105 9 1/2 x 15 42.0 130.00 5 71.6 Istera Imperator VA
RS106 12 1/2 x 15 4.0 130.00 5 71.6 Istera Imperator HA
RS109 9 x 16 30.0 108.00 5 0.0 Ferrari Tetarossa VA
RS110 12 1/2 x 15 -3.0 108.00 5 0.0 Ferrari Testarossa
RS111 7 x 16 11.0 108.00 5 65.1 Volvo 740,760
RS112 7 1/2 x 16 17.0 108.00 5 65.1 Volvo 740,760
RS113 10 x 16 -15.0 130.00 5 71.6 Porsche 928 HA
RS114 11 x 15 -35.0 100.00 4 57.0 BMW 3,3/1
RS115 8 x 16 30.0 112.00 5 57.0 Audi 100,200
RS116 8 x 15 3.0 100.00 4 60.0 Renault Alpine GT VA
RS117 9 x 15 3.0 100.00 4 60.0 Renault Alpine GT HA
RS118 11 x 15 15.0 100.00 4 60.0 Renault Alpine GT HA
RS119 10 x 16 43.0 108.00 5 71.0 Ferrari Testarossa HA
RS120 11 1/2 x 15 -34.0 130.00 5 71.6 Porsche 911,930,944
RS121 8 x 15 12.0 108.00 4 57.0 Audi 80Q,90Q
RS122 9 x 15 3.0 108.00 4 57.0 Audi 80Q,90Q
RS123 8 x 16 18.0 130.00 4 65.0 Maserati Merak HA
RS124 10 x 16 30.0 130.00 4 65.0 Maserati Merak HA
RS125 7 x 16 11.0 108.00 5 58.0 Ferrari 328 VA
RS126 14 x 15 -54.0 130.00 5 71.6 Porsche 911,930
RS127 9 x 15 -36.0 100.00 4 57.0 BMW 3,3/1
RS128 11 x 15 -61.0 100.00 4 57.0 BMW 3,3/1
RS129 13 x 15 -74.0 100.00 4 57.0 BMW 3,3/1
RS130 10 1/2 x 15 -22.0 130.00 5 71.6 Porsche 911,930,944
RS131 8 1/2 x 16 56.0 130.00 5 71.6 Porsche 928S VA
RS132 9 1/2 x 16 59.0 130.00 5 71.6 Porsche 928 S
RS133 8 x 16 21.0 112.00 5 66.5 MB 107 ab Bj.9/85
RS134 8 x 15 -23.0 100.00 4 56.5 Opel Kadett E
RS135 7 x 16 36.0 108.00 4 65.0 Saab 9000
RS136 11 x 15 -10.0 100.00 4 57.0 Opel GT
RS138 7 x 15 16.0 100.00 4 56.5 Opel Kadett E
RS139 9 x 15 3.0 100.00 4 56.5 Opel Kadett E
RS140 8 x 15 28.0 100.00 4 57.0 Opel Manta B
RS141 9 x 16 36.0 120.00 5 69.5 Opel Monza
RS142 9 x 16 8.0 112.00 5 66.5 MB 107
RS143 9 1/2 x 15 12.0 100.00 4 60.0 Renault Alpine GT HA
RS144 11 x 15 -30.0 130.00 5 71.6 Porsche 911,944
RS147 10 1/2 x 15 -47.0 120.00 5 72.5 BMW M1 VA
RS148 13 x 15 -72.0 120.00 5 72.5 BMW M1 M635CSi HA
RS149 10 1/2 x 15 -22.0 120.00 5 72.5 BMW M635CSi VA
RS152 7 x 15 25.0 108.00 4 65.0 Saab 9000 bis Bj.8/86
RS153 9 1/2 x 15 -15.0 120.00 5 72.5 BMW 635CSi
RS154 11 x 15 -72.0 120.00 5 72.5 BMW 635CSi
RS155 7 x 15 30.0 114.30 4 71.6 Saab 900
RS157 7 x 16 49.0 130.00 5 71.6 Porsche 924 S,964 VA
RS159 7 x 15 25.0 108.00 4 65.0 Saab 9000
RS161 12 1/2 x 15 5.0 130.00 5 71.6 Porsche 928 S HA
RS164 9 1/2 x 15 9.0 100.00 4 60.0 Renault Alpine
RS165 11 x 15 -26.0 100.00 4 60.0 Renault Alpine
RS166 13 x 15 -48.0 100.00 4 60.0 Renault Alpine
RS168 10 1/2 x 15 -22.0 112.00 5 57.0 Audi 200 Quattro
RS169 13 x 15 -54.0 112.00 5 57.0 Audi 200 Quattro
RS170 11 x 15 -31.0 120.65 5 73.9 Jaguar XJ,XJS
RS171 14 x 15 -54.0 120.65 5 73.9 Jaguar XJ,XJS
RS172 7 x 15 38.0 98.00 4 58.1 Lancia Delta 4WD
RS173 8 x 16 24.0 112.00 5 63.5 Ford Scorpio
RS177 8 1/2 x 16 46.0 120.65 5 70.3 Chevrolet Corvette
RS178 9 1/2 x 17 56.0 120.65 5 70.3 Chevrolet Corvette
RS179 7 x 16 35.0 112.00 5 63.5 Ford Scorpio
RS181 9 x 15 3.0 108.00 4 63.5 Ford Escort
RS182 8 x 15 12.0 108.00 4 63.5 Ford Escort
RS183 13 x 15 -74.0 108.00 4 63.5 Ford Capri HA
RS184 13 x 15 -79.0 130.00 5 71.6 Porsche 911 HA
RS185 8 x 15 3.0 100.00 4 57.0 BMW 3/1
RS186 13 x 15 -48.0 100.00 4 57.0 BMW 3/1 HA
RS187 9 x 15 -36.0 108.00 4 57.0 Audi 80 Q
RS188 11 x 15 -61.0 108.00 4 57.0 Audi 80 Q HA
RS190 9 x 16 -2.0 120.65 5 73.9 Jaguar
RS191 10 x 16 -2.0 120.65 5 73.9 Jaguar HA
RS192 9 x 15 -36.0 108.00 4 63.5 Ford Capri
RS193 11 x 15 -61.0 108.00 4 63.5 Ford Capri
RS194 8 x 15 16.0 108.00 4 57.0 Audi 80,90,Quattro
RS195 8 x 17 35.0 110.00 5 65.0 Opel Omega,Senator
RS197 9 1/2 x 17 13.0 120.00 5 72.5 BMW 5/H,7/1 HA
RS198 8 1/2 x 17 13.0 120.00 5 72.5 BMW 7/1
RS199 8 x 17 32.0 112.00 5 66.5 MB 124,24V
RS200 8 1/2 x 17 13.0 112.00 5 66.5 MB 126
RS201 10 x 16 49.0 130.00 5 71.6 Porsche 944 HA
RS202 7 x 15 25.0 98.00 4 58.1 Lancia Delta Integrale
RS203 9 1/2 x 15 -10.0 112.00 5 66.5 MB 126
RS204 12 1/2 x 15 -60.0 112.00 5 66.5 MB 126
RS205 9 x 15 -3.0 112.00 5 66.5 MB 126
RS206 11 x 15 -31.0 112.00 5 66.5 MB 126
RS207 6 1/2 x 15 34.0 114.30 4 64.1 Honda Legent
RS208 10 x 16 -30.0 130.00 5 71.6 Porsche 928
RS209 7 x 15 15.0 108.00 5 65.1 Volvo 740
RS210 8 x 16 24.0 108.00 4 65.0 Saab 9000
RS211 8 x 16 11.0 120.00 5 72.5 BMW 5/H,7/1
RS212 8 1/2 x 17 13.0 120.00 5 0.0 BMW 5/H,7/1
RS214 7 x 15 38.0 114.30 5 59.6 Ford Probe
RS215 7 x 16 38.0 114.30 5 59.6 Ford Probe
RS216 7 x 16 22.0 108.00 4 64.0 Ford Mustang
RS217 8 x 16 22.0 108.00 4 64.0 Ford Mustang
RS218 6 x 15 3.0 100.00 4 57.0 Jamaha FJ 1100 (Gespann)
RS219 9 x 16 9.0 108.00 4 57.0 Audi 80, 90 Typ 89
RS220 7 x 16 20.0 108.00 4 63.5 Ford Sierra Cosworth
RS221 8 x 16 20.0 108.00 4 63.5 Ford Sierra Cosworth HA
RS223 7 x 16 30.0 108.00 4 63.5 Ford Cosworth
RS226 8 x 16 30.0 110.00 5 65.0 Opel Omega,Senator
RS227 6 1/2 x 15 32.0 108.00 4 65.0 Saab 9000
RS228 9 x 16 22.0 108.00 4 57.0 Audi 80,90
RS229 7 x 16 24.0 98.00 4 58.1 Fiat,Lancia
RS230 7 1/2 x 16 18.0 98.00 4 58.1 Fiat,Lancia
RS231 7 x 16 52.0 108.00 5 60.0 Renault R 25 Turbo
RS236 8 1/2 x 17 30.0 112.00 5 57.0 Audi 200 V8
RS237 8 x 15 -10.0 100.00 4 57.0 VW Golf II
RS238 6 1/2 x 15 34.0 114.30 5 66.0 Nissan Maxima
RS239 7 x 16 37.0 114.30 4 66.0 Nissan 240 SX
RS240 6 x 14 40.0 100.00 4 56.0 Honda Accord Concerto CR-X
RS241 6 x 14 35.0 114.30 4 66.0 Nissan Bluebird,Silvia
RS242 6 x 14 30.0 100.00 4 57.0 Isuzu Toyota Gemeni MR2
RS249 7 x 15 30.0 98.00 5 58.1 Alfa 164
RS250 8 1/2 x 16 25.0 114.30 5 60.0 Toyota Supra
RS251 9 x 16 30.0 112.00 5 66.5 MB 124 VA
RS252 9 x 16 25.0 112.00 5 66.5 MB 124 HA
RS254 8 1/2 x 17 28.0 114.30 5 60.0 Toyota Supra
RS255 8 1/2 x 16 56.0 130.00 5 71.6 Porsche 928 S VA
RS256 9 1/2 x 16 43.0 130.00 5 71.6 Porsche 928 S HA
RS257 8 x 17 49.0 130.00 5 71.6 Porsche 964 VA
RS258 9 1/2 x 17 52.0 130.00 5 71.6 Porsche 964 HA
RS268 7 1/2 x 16 30.0 114.30 5 59.5 Mazda 626
RS269 7 1/2 x 16 28.0 100.00 5 54.1 Toyota Celica,Camry
RS270 8 1/2 x 17 13.0 130.00 5 71.6 Porsche 964
RS271 10 x 17 0.0 130.00 5 71.6 Porsche 964 HA
RS274 9 x 17 20.0 114.30 5 60.0 Toyota Supra VA
RS275 10 x 17 7.0 114.30 5 60.0 Toyota Supra HA
RS276 9 1/2 x 17 0.0 112.00 5 66.5 MB 124,126 VA
RS277 12 x 17 -45.0 112.00 5 66.5 MB 124,126 HA
RS280 7 1/2 x 16 35.0 114.30 4 64.1 Honda Accord 90
RS281 7 1/2 x 16 34.0 114.30 5 60.1 Toyota Lexus 400
RS282 7 x 16 35.0 114.30 5 66.0 Nissan Infinity Q 45
RS284 10 x 17 10.0 110.00 5 65.0 Opel Omega
RS285 8 1/2 x 18 13.0 120.00 5 72.5 BMW 5/H,7/1,evtl.8
RS286 9 1/2 x 18 13.0 120.00 5 72.5 BMW 5/H,7/1,7/G,evtl.8 HA
RS288 7 1/2 x 15 32.0 108.00 4 57.0 Audi 80,90,Q Typ 89
RS289 8 1/2 x 18 20.0 112.00 5 66.5 MB 129
RS290 9 1/2 x 18 18.0 112.00 5 66.5 MB 129 HA
RS291 8 x 16 30.0 114.30 4 66.0 Nissan 200SX
RS292 10 x 16 30.0 112.00 5 66.5 MB 124
RS295 8 1/2 x 17 25.0 110.00 5 65.0 Opel Omega
RS296 8 1/2 x 16 22.0 112.00 5 66.5 MB 129 VA
RS297 7 x 15 40.0 114.30 4 64.1 Honda Accord 90
RS298 7 1/2 x 15 32.0 114.30 5 66.0 Nissan Infinity Q 45
RS301 7 1/2 x 17 33.0 100.00 5 57.0 VW Golf/Passat III plus
RS302 8 x 17 40.0 120.00 5 72.5 BMW 3/C
RS303 7 x 16 40.0 114.30 4 64.1 Honda Accord 90
RS304 7 1/2 x 15 30.0 100.00 5 54.0 Toyota Carina
RS305 7 1/2 x 15 30.0 114.30 5 59.6 Mazda 626 MR2 90
RS306 8 x 16 43.0 114.30 5 70.0 Honda NSX VA
RS307 9 x 17 42.0 114.30 5 64.0 Honda NSX HA
RS311 10 x 17 16.0 130.00 5 71.6 Porsche C62 VA
RS312 13 x 17 -22.0 130.00 5 71.6 Porsche C62 HA
RS314 7 1/2 x 16 33.0 108.00 4 57.0 Audi 80,90
RS315 8 x 17 35.0 100.00 4 56.5 Opel Calibra
RS319 7 1/2 x 15 32.0 100.00 4 54.0 Mazda 323
RS325 7 1/2 x 16 30.0 114.30 5 59.6 Ford,Mazda Probe,626/RX 7
RS326 7 1/2 x 16 35.0 114.30 4 66.0 Nissan 200 SX,Primera
RS331 8 x 17 35.0 114.30 5 60.0 Toyota Lexus 400
RS332 9 x 15 15.0 100.00 5 57.0 VW Corrado VR6
RS333 11 1/2 x 15 -52.0 100.00 5 57.0 VW Corrado VR6 HA
RS334 7 1/2 x 17 33.0 108.00 4 57.0 Audi 80;90 Typ 89
RS335 8 1/2 x 17 32.0 114.30 5 66.0 Nissan 300 ZX
RS354 7 1/2 x 16 28.0 100.00 4 56.0 Honda Civic
RS700w 8 1/2 x 18 22.0 120.00 5 0.0 BMW 5/neu,7/G
RS701w 10 x 18 25.0 120.00 5 0.0 BMW 5/neu,7/G HA
RS702w 8 x 17 35.0 112.00 5 0.0 Audi,MB A4,A6,A8;124,E420,202
RS703w 8 x 17 40.0 120.00 5 72.5 BMW 3/C,3/B,M3
RS704w 8 1/2 x 18 22.0 112.00 5 66.5 MB 124,E500,R129,600
RS705w 10 x 18 20.0 112.00 5 66.5 MB 124,E500,R129,600 HA
RS706w 8 1/2 x 18 45.0 130.00 5 71.6 Porsche 993,Turbo
RS707w 10 x 18 50.0 130.00 5 71.6 Porsche 993,Turbo HA
RS708w 9 x 20 22.0 120.00 5 0.0 BMW 5/D,7/G
RS709w 10 x 20 25.0 120.00 5 0.0 BMW 5/D,7/G HA
RS710w 8 1/2 x 18 32.0 112.00 5 0.0 Audi,MB A8;124,E420,202,140
RS711w 10 x 18 40.0 112.00 5 66.5 MB 140
RS712w 8 x 17 38.0 114.30 5 0.0 Lexus,Toyota,Nissan LS/SC400,Supra,Inf.Q45
RS713w 8 x 17 15.0 120.00 5 0.0 BMW 5/H,7/1,5/D
RS714w 8 1/2 x 18 38.0 120.00 5 72.5 BMW 3/C M3
RS715w 7 x 17 35.0 100.00 4 0.0 Hon.Maz.Mit.Opel,Ren.Rover Seat,Tojota,Volvo,VW
RS716w 7 x 17 40.0 114.30 4 0.0 Hon.Hyn.Mit.Nissan,Rover
RS717w 8 1/2 x 18 40.0 114.30 5 0.0 Mazda,Nissan,Toyota
RS718w 10 x 18 45.0 114.30 5 0.0 Mazda,Nissan,Toyota
RS719w 8 1/2 x 18 28.0 120.65 5 73.8 Jaguar XJ,XJ-Rit....
I'll double check my factory list when I get home, but anyone who likes these wheels this may prove useful.....