No I mean regulator (the part numbers I listed), located on the back of the fuel distribution rail that wraps around the top of the engine - held in place by a circlip/snap ring. There are a bunch of posts indicating this can be the cause of problems at warm start issue. I do have a full parts car, which did not exhibit this symptom when last it ran - I can easily swap the regulator. I believe on the 400E any accumulator is part of the fuel pump.

So original question still stands - anyone know about cross referencing part numbers? Prices for Bosch seem to vary from ~40 to 100+ if they all map to the same Bosch part I'll buy the cheap one.

paul