Here is a photo of the back of the 13b RE motor.
Ernesto Sanchez
Rotary Canard
res0391z@gte.net
http://home1.gte.net/res0391z/index.html

Looks like the auto tx flex plate ring gear is larger as well.
Its this getting more and more complicated as we go along.
I suggest putting in the stock auto tx flex plate and ring
gear. This is a real can of worms. An early starter may not
work with this ring gear because of the tooth form.

Paul Lamar

Snip
     Like I said in previous post you would have to use 86-91 auto
 Tx flex plate and starter (much easier to find) on 93-95 13BREW
 and 13B/20B Cosmo engines to use your cast housing.

     Kelly troyer

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