Source for 46T rear sprocket ??

I have googled and searched but cannot seem to locate a source for a 46T rear sprocket. Suggestions ??

Got mine from Busters Dirt Shop. It's an AFAM brand aluminum sprocket for a yz450 if I recall. Call them up and let them know what you want to do, they made the suggestion and it worked out great. It's a dual bolt pattern sprocket so it didn't require different mounting bolts.