Yes, all Cosmo stock 20Bs used auto tranny internals-the car was only sold
with an auto tranny. (BUT, you might have gotten a special set-up?)
 An auto tranny 13B flexplate would be all that is needed as your 20B already
should have the 20B automatic counterweight, No? Does the mass of the 13B
auto tranny flexplate make a difference when attached to a 20B vs the 13B?
Probably not considering you are going to attach a propellor and PSRU to that
rotating mass.
If you want I will take dimensions off my 20B "flexplate" and let you know my
stock dia set up. I might also have a 94 auto tranny lying around that I can
measure.
Marc

 
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