IH-61959-C1- 7/16 X 145 1/2" Long
might wanna wait for one or two more answers, but my paper says that one for the tractor model #s 800, 1000, 1200, 1250, 1450, 1650 & tractors with serial numbers530,000-665,000
I have a 1a tiller and copied the info and printed lol, originally got it from another fourm BUT its probably on here
with a 1, 1a, 2, 2b, and 371 tiller