Chain, gears needed for '78-'80 JAG 2000

My '78 JAG 2000 drive chain broke, as did one of the teeth on the small gear. Anyone have some used parts out there?

Gear 0107-651 (this is the one I really need)
Gear 0107-653 (the one I have has all of its teeth intact, but looks worn)
Chain 0107-773 (8 wide x 70 link)

Thanks for your time.
Jim

Chain, gears needed for '78-'80 JAG 2000