49 tooth rear sprocket 1982 to 1985 Harley Davidson Sportster. Bought a box of these. You can see the part number 41470-82a that's on the packaging in one of the pictures. Found research in an Old Dixie Distributing catalog. Did further research on the internet but forgot to print it out but this fits 1982 to 1985 Harley Davidson Sportsters according to the internet. The catalog only said 1982 and later.