I need some guidance!

I have a 20B with a  automatic flywheel that is about 12 5/8" od.  The PSRU
unit I have will only take one 11 5/8" od.  A friend has a 13 B with the
correct size but doesn't know what year it is, and he has a use for it.  The
junk yard has a 88 and 90 flywheel that are the same diameter as mine.

 What year goes with what size, and does anyone have the smaller one for
sale?

Thanks

Bob Darrah

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