Me again, asking about pumps. My injector pump is FUBAR'd so I'm on the hunt for another injector pump, now all the part numbers are the same except for the last letter - mine is A - can I find one that ends in A anywhere? No! I've been offered a whole running car but the pumps ends in an D, typical. Will it work? What can really be that different?? I have access to other parts as I'll be buying the car as a whole so would I need to change any other parts to make the 'D' pump work? Thanks in advance.