C10 inner primary chain case.

[Rick Rybicki]

My 1946 C10 (pre alternator type) has the inner primary case with the "captive" sliding washer behind the clutch. The Washer has become worn and broken in places. I believe they are not replaceable. Questions:
Should the sliding washer rotate with the sprocket?
Is it the case that the sliding washer is non replaceable?
Is the inner case from a C11 with same "captive" sliding washer compatible with '46 C10?
Can a later inner primary case with the later and more common slider plate and felt washer be fitted to a '46 C10?
Looking forward to some info. Thanks, Rick.