Recently I got the chance to go look at a 1972 Honda Cb450 that I was contacted about. A woman owned this bike, and asked me to come by and look at it. It was in pretty good condition for its age and has been in her dry garage covered in blankets since 1987. She fell ill and could not ride it anymore. I just have a few questions on what is interchangable on the cb's. I found a Cb350 seat that is in good condition and was wondering if I could use that to replace the beat up original 450 seat. Second, do all of the earlier Cb's use the same front master cylinder rebuild kit? That's all I can think of for now, and I might be going to see it again this week. Thanks to anyone who can help me out.