eBay Sprocket Kit What size chain does it use?

I need a rear sprocket and mount for the 3hp Briggs motorized bike im building (from a chopper bike) and was wondering if anybody knew what size chain this sort of sprocket would have? for my build i NEED a #35 chain

I only need the rear sprocket as i plan on custom mounting the motor and other accessories.

Thanks,
Eddie

http://www.ebay.com/itm/415-44T-Spr...Parts_Accessories&hash=item5651ce4ef4&vxp=mtr