George Lendich wrote:

I agree. That way we can use any mazda mt starter, incl the 3rd gen (if
it mates with the ring gear-probably not unless you use the same 3rd gen
ring gear, and I don't think it will fit Tracy's psru w/o mods......
[Marc Wiese]

Mark,
Unsure what you mean exactly, but all the ring gears have the same tooth
profile and the snout hole is relatively in the same position - it's the
starter mounting bolt holes which are all different.

I'm speaking about the lighter weight starters only.

All the flex plates are interchangeable, including the 12A however there is
difference in the depth of flexplates which affect the position of the ring
gear-naturally.

There is also a bit of difference in the depth of the (engaged) starter
pinion.

Confused - who isn't!!
George (down under)

The starter pilot (snout)  hole position is determined by the pinion gear diameter 
and the ring gear diameter both of which varies. Flex plates might be hard
to find in the future and some may wish to use lightweight flywheels instead.

Paul Lamar
 
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