fiat124spider

Hi Guys, I'm new. I live in Portugal and always loved doing trials but in a very "unpro" way. I mean I have limited time to ride the bike, so if ride the bike I often feel like it has sqaure wheels, flat tires, and it on purpose makes me fall. Anyway, I still have a brand new exhust pipe lying in my shed and don't know what to do with it. The problem is I don't really know for wich bike it is. I know I bought it years ago from a trials lover (sorry for my bad English, I'm from Belgium) so I'm quite sure it's suppose to fit on a Honda Trials bike. But wich bike? Here are the specs: HM446 Honda Krizman Spark Arrester Model 411 US Pat #3407575 SANKEI 2045 Hopefully someone can help me out. Regards. Michel Portugal