Thanks for the leads everyone - we are actively pursuing several, will see if it succeeds.
We really should have both gears. It still worked, but the fiber cam gear is worn and the crank gear has some "fissures" caused by rust. I can't find a number on the crank gear, but the cam gear is 642516, and the gear measures .900" wide. If we can't find a set we might go with the E-bay crank gear.
Although still interested if anyone has one!
Thanks again
Ken