Hey this is exactly the problem I've been describing in another string. I have a 6503 crankset and a 6603 FD. I had to raise the FD to give me clearance to get the inner cage plate past the middle ring. It doesn't shift onto the big ring as nicely as I'd like but it does work. I also aligned the inner plate with the ring and not the outer plate. This was a tip from the online store I bought the FD from. It seemed to help with noise. I'd like to find a 6503 as well and be able to set things to spec.