the best thing to do is go somewhere and try a few to see which fits you the best.
the main consideration is to go for one with a slim seat, as most bucket seats end up sitting too hign off the floorpan, and you hit your helmet on the roof!
the crucial bit is getting the mounting right, and this is usually custom made brackets welded up and bolted to the mount points.
if you don't need adjustment this is fine.