I have never seen a post where people tell which parts are compatable with other bikes. I know you can go to the search function but wouldn't it be easier if we had a catagory for it. Sometimes when I am in here lookin' for parts.....I see something cool off of a 500/550 and wonder if it would fit on my 750. This could also work for 350/400..........differences of parts between the years (example-- An early seat or grab bar are different than a 77'/78'). Stuff like lights,gauges,fork ears, bar controls, etc.