The link for the Goodyear blackhawk belts.
Using this link and the pdf it points to, someone with mechanical knowhow could fab one up I imagine. I believe Ozzie takes a stock sprocket, cuts the teeth off, welds on the belt tooth thingamajig, then makes a new pulley for the rear as well. The link has pulley specs for those that know that kind of stuff, not me though.

A word to the wise is not necessary. It is the stupid ones who need the advice. Pat