I would like to swap either a 1995 or 1996 C36 engine into my 1993 or 1995 coupe. I would like to stay away from a 97 C36 engine because of other parts swapping that needs to be done, etc.

I was told that I would need the upper engine wiring harness part number 124-440-2933. Does anyone know why I would have to use this part number if my 95 W124 coupe has the 124-440-5632 harness?

Thanks