Hello, I must be going crazy but I can not find a replacement for my ECM. 1991 420SEL. The part number is: Mercedes # 008 545 06 32 and the Bosch # 0 265 106 015.

I have bought 2 from used parts dealers and can not get the right one. Everyone tells me that the one they will send would work, but they don't. Is this just a hard part to find?

Thanks for any help.