A discussion about buying the skyway wheels (all the wheels that I know of that came in the kit are skyway) that came in the kit is here
Ordering skyway wheels
Not really shure what your wanting as far as the sprockets, but the ones that came in the kit for the predesigned drive train are #35 chain 45 tooth and 10 tooth with a 5/8" keyed bore they are avalable from
mscdirect.com
Also you may check with any local bearing and mantainece suppliers, we use applied industries for most all of our gear, sprocket, and bearing needs.