I did that allready, came up with 3 part numbers. Even the bosch cataloque doesnt have the e34 540 in it. the closed that I got was the pump of the m5 e34. It flows 130 l/h which enough for the 540. Another thing I can do is remove my pump and check the number but thats alot of work. I also saw that some 540's have a pierburg pump. Thats why I thought someone might have the number at hand:bawling: