I have the spring and I'll see if it fits. This morning it was 1 degree F. I'll chip the bike out of the ice.
I'll use it in addition to the spring we already have.
FCC Japan is the company who makes this clutch and 95%+ of all motorcycles use a clutch made by FCC. Even Ducati uses them, so it's probably more like 99% now.
For that reason, many parts are compatible with other models but it would be impossible for a small company to try all of the goofy combinations we all think of.