OK, confirmation of part numbers to do delivery valve repair (and clear fuel lines) on a W124 with 606 engine:
The job is the same as ParrotOfDoom's How-to apart from the difference in inlet manifold removal. Link
HERE
Once thats removed then its pretty much the same. You will need to replace the corner and straight breather bungs as below.
Part numbers needed:
W617589010900 - Special tool (if MB wont sell you this, search online - you can also buy it elsewhere) Price: Approx £25 i think
A6061410080 - IM gasket (might be able to re-use it if the manifold has been off recently) Price: £10.11
A6060160081 - rubber corner breather bung - these break when you remove the manifold. You need 6 of these. You may get away without removing all of these or they may not break but they probably will!!! Get 6! Price £1.76 each
A6060160181 - rubber straight breather bung - also breaks so you will need 3 of these. You may get away without removing all of these or they may not break but they probably will!!! Get 3! Price £2.99 each
A6030780141 - high pressure fuel line clips - will probably break when you remove them so you will need a few spare just incase. You may get away with re-using, so 3 of these should be ordered just incase. Price: £1.06 each
A0049974540 - rubber o-ring (this is the oring causing you your leak). You need 6 of these - I got 8 just incase something went wrong when torquing them down... something to consider for the price! Price: £0.47 each
A0179974148 - copper washer - not 100% required IMO but cheap so worth replacing anyway. 6 is all you need. Price: £0.35 each
Additional/Optional:
when you are doing this job, and because you have leaks from the delivery valves, I suggest replacing all your clear fuel lines aswell as if your DVS are worn, then these will be too:
you need one of each of the following. You dont have to do these at all if you dont want to!
A6050701432 - Price £5.12
A6060700532 - Price £8.52
A6010705332 - Price £5.52 (this comes with the additional new banjo & ring i think)
A6060700032 - Price £4.64
A6060700232 - Price £6.05
Also, when you are here, replace:
A6019970148 (larger o-ring on pre-filter) - Price £0.59.
I'd also be tempted to renew the main screw on fuel filter: A6010900352 and also clean or renew the pre-filter A6010920105.
All prices are without any discount. You should be able to secure a 10% discount on all these parts.