Not sure about that, but my, sporty is 03 & same pully up front as my 2,000 Buell, Buell has a wider 17" rear wheel. but Buell a lot lower gearing than the sporty, one light flywheels, one heavy flywheels.they inter change ( not sure about belt length but the two pulls the same.

I'll have to look at mates very late 09 Buell's ( he has two ) but his rear pull looks slimmer, he said it was just mine had side wall's to keep belt true. late Buell rear pully like its machined off. but this same width belt. I have a few size gear box belt drive pullys. but three are at Cow's, I'll get my spare two ( just got in a swap with mate ) probably next week so could take some pic's show you and also measure. I think my biggest has 29 or 30 tooth my smallest has 26 tooth & made from alloy ( lot lighter ).