How to ID rear wheel?

[wkbrdbm]

I just purchased a used CRF 450R that had a crack in the rear wheel. The guy I bought it from had a spare wheel that he said would work. After getting it home, it looks like it may not work. The spare is a 36 spoke wheel with 6 bolt rotor mount (I think it may be off a Yamaha). The CRF is 32 spoke with 5 bolt rotor.

I would like to sell this wheel and buy a rim to replace the cracked one. Is there anyway to ID this wheel to what it came off of?

 

[uh_oh]

have you even tried to see if it will mount?
are you sure its not aftermarket?