I have been looking around about this for awhile, and posted once or twice related top this topic. No luck so I'm posting again. I did a motor swap awhile back. I have a 2001 GSX-R 750 and put a 2003 motor in my bike. The problem is the throttle bodies. I had to use the 2001 throttle bodies. The motor didn't have the TB's with it so I had to use the old ones. Well after I put the motor in I found out that they don't fit as well as they should. I looked and the TB design between the 01' and 03's are different! What all do I have to do to make the 03's fit? I was told by a few that they will mount right up without any problems? Is this true? I saw a few things are in a different location and/or only use 1 screw to attach as opposed to 2 or 3 screws (TP sensor, STP sensor, etc). I was looking for a set of 03' TB's and saw a set on Ebay. Funny thing is I looked and they're the 01' design (1 piece TB). I believe the 02-03's are a two piece design from my knowledge (L and R sides). Also will I have any problems since the 02-03 have an auto fast idle system? The 01' has a manual choke lever? I want to do this because when I try and put the air filter box on the screw at the front doesn't match up, and I had to tilt the TB's slightly to get the air box to fit properly. Bike runs and everything just irritating knowing that the TB's and air box have to fit like that. Thanks and sorry for the long thread.