Here is my problem. I took my 1998 528i to the dealer for an inspection (just purchased). The dealer said I had a cracked head which I did verify. I purchased a rebuilt head from Ken Baker Originals (Marion, SC). The head I purchased came with the valves, tower, lifters, etc. However, the tower caps were not installed on the head I purchased. I took the head to the dealer who installed the head without inspecting the head first. It turns out that the head that I purchased had a different size springs and lifters, therefore, my caps would not fit. Here is my problem!!!

Ken Baker originals says it is the correct head and parts for a 1998 528i and will not supply reimbursement for any labor and gasket to install the second head that they supplied to the dealer that was different then the first. The dealer says their not at fault either. I believe they both are responsible. How do I prove what car the first head came from? The only information that I have is the diameter of the lifter. My origianal head had lifters with a diameter of 42mm. The first head supplied by Ken Barker Originals had a diameter of 44 mm. Can any one lead me in the right direction to determine the size of the lifters in any given head? Help