So I have several different set up.I even have a 250r grab bar on a z400 also.The important thing is that 86-89 R's have the same wide at the grab bar 10 inches, so adapting any year grab bar is as easy as drilling a pair of holes. On a side note trx450r's are the same width but bolt patter is different. If your adapting one to work there are somethings to consider like, extended length doesn't let the bike stand straight up if your transporting or working on it that way. Extended length also keeps u from looping out( it drags before u bail out). Extended length also looks better IMO cause R plastics hang out a lot in rear, also protects rear fenders from possible damage. I like to use early R grab bar and install plastics then measure it up and drill and cut excess. My 2 cents.