The "whale tail" on my SuperSport seat has been patched/doctored up with more than 3 pounds of Bondo. Looks awful and is falling apart. Since this is a "rat rod" project, gluing a broken one back together, or one that is quite beat up is right in line with the plan. I've had good luck gluing Honda plastic, anyway. If you have one hanging on the wall because you replaced it with a nice one when you dropped the bike or replaced it with a cafe, tracker, brat, etc. seat drop me a PM and let's see if we can keep it from gathering more dust in your garage. I think '79 - '82 CB750F or CB900F will work.