Ok doing a little more research, and with the help of Gurdian's advice i was able to come up with these
For the input sprocket that comes off of the planetary gearbox:
Sprocket 15 tooth; 35 Chain
MSC
http://www1.mscdirect.com/CGI/NNSRIT...MT4NO=16269339
Grainger
http://www.grainger.com/Grainger/wwg...mId=1611578574
And the Sprocket that is bolted to the wheels:
#35 chain, 1.25” bore, 1/4” hub, #10 mntg
holes in a 1.875” D circle
MSC
http://www1.mscdirect.com/CGI/NNSRIT...MT4NO=16269485
This one will need holes drilled in it.