My adapter are made from the same pattern, as if I swap sides and turn them upside down, they fit either the 280 or 300 mm rotors.

for 300mm rotors, Yamaha YZF rotors work very well, and are plentiful. Easily first choice. EBC makes some reasonably priced steel rotors which work well if you want new. and if you search long enough, you can find some old stock 300 mm Brembo cast iron full floaters. There are also 300mm brembo rotors on the newer 620 Monsters and a few other models that will fit. The most rare are the ones on the first edition of the 907. If you lived in the US, i would send you the spare YZF rotors I have for a reasonable price.

Cheers, Phil

Welcome to the madness. If I (we) can be of any help - just ask. I know nothing about mechanics or engineering but I have a very absorbent shoulder!!

Congratulations on the purchase I have been keeping a half-interested eye open for a 750 Sport for years but I missed that one

Ride Safe