You can get the "data card" for a car on the Mercedes EPC (Electronic Parts Catalogue) you can buy access to that from Mercedes or you get it bundled with member ship of
Official Mercedes-Benz Owners Club
There is another way which is free and imediate through this Russian site.
Êàòàëîã çàï÷àñòåé Mercedes, ïîäáîð àâòîçàï÷àñòåé äëÿ Ìåðñåäåñ ïî àâòîêàòàëîãó.
Try it... works on my 1984 SL. tells me I have these options:
260 TYPE DESTINATION ON TRUNK LID - ELIMINATION
420 AUTOMATIC TRANSMISSION 4-GEAR
440 TEMPOMAT (CRUISE CONTROL)
461 INSTRUMENT WITH MILES IND. AND ENGLISH LEGEND
565 REAR SEATS USED ON SL MODELS
583 ELECTRIC WINDOW LIFTER, 2-WAY
592 ALL-ROUND WD-GREEN GLASS,HEATED REAR WINDOW-VSG
600 HEADLAMPS - CLEANING EQUIPMENT
613 LAMP UNIT - ASSYMETRICAL, LH TRAFFIC
640 15-HOLE LIGHT ALLOY RIMS
682 FIRE EXTINGUISHER
744 DARK BLUE SOFT TOP FABRIC 5010