Just a thought mate, does anything else fit? Yams used to be known for their "bin bikes" ie what have we got left in the bins, ok, let's build a bike..! is anything compatible with your bike, I mean they had the XS series of bikes from the XS 650 / 750 / 500 / 400 and the 1100 series, is there nothing on those that will do for yours? You might even get lucky if you used just the part number as your guide. Gotta be worth a try! Just putting it out there.