Did an engine swap computer did not match w/95 e34. The engine being swapped came from a 1992 e34 but there is no build date on the engine only the year it was built 1991 - Since there was 2 different computers for that year the Bosch 405 thru 8/91 and Bosch 403 from 9/91 - 1/92 I cannot locate the vehicle the engine came from. I have spoken with several BMW dealers and all they can gave me is the part # 1214744859 for the DME. I have given to them the serial # that is on the 91 engine
WBAHD6319NBG69649 with no avail. I have call several recycle parts dealers and I'm being ask for the Bosch Number. Have any idea on how to resolve this issue? Will be greatly appreciated

Thanks.