19A clutch and starter cup. 1 3/16" cup height from the clutch out. You have the clutch ID and OD. It's a Fairbanks morse clutch.
I did some comparison and I have no doubt my model 21 clutch and drum will fit, just a smaller OD. No big deal if they drum matches the clutch. Also, it seems like a 270/275 straight shaft, keyed clutch would fit. For either of these swaps, you have to drill and install a roll pin for the starter cup.
Thanks, that will help a lot, it did mention in the manual the clutch setup could be used on either side of a crankshaft.
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