picked up a couple big sprockets that came with some dirtbike rears i wanted at an auction . they are both sprocket speacialists . the first has 4811 66 stamped on it . looked it up from what i can tell may fit 2011 suzuki gsxr . the second is black and has 821z 60 stamped on it . checked that on the sire honda cbr 600 rr was 821 but no Z . so not sure . i will not need these so would like to make sure what the yfit before trying to sell them . thanks for any help .