Someone will correct me if I am wrong so here is my answer. The tracks will interchange between the Fifteen (PV series), Small Twenty ( 8C series), the Twenty Twos and the D2's, depending on how wide the pad is. There are differences in the link designs, counter bored links vs. non counter bored links and master pin styles. The sprockets will interchange between the late Twenty Twos and the D2's. The difference in the sprockets between the PV Fifteens, 8C Twentys and the early Twenty Two's and the late Twenty Twos' and the D2's is that the early tractors had the sprocket keyed to the sprocket shaft and the late tractors had the sprocket splined to the sprocket shaft.
Have a great day!!
Ken
I was never too sure about this but I think Nalorbros nailed it. I am pretty sure the D2 is 6 1/8" pitch. I just went out and measured the 8C 20 and it seems to be the same.
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