Paul,
this file is proven bolt hole positions based on cmm data for bell housing.
It appears the low power rx8 engine may have a different rear plate.
With the plate being cnc machined, I would make several versions based
on the housing they are using.
Easy enough, once the programs are written.
Larry

Yes I think you are right. I suspect the only difference is down on the left side
where the auto tx starter is located. There is a bell housing bolt missing.
No problem for us as that bolt can be left out.

The latest RX8 low power auto tx engines appear to
be the same as the high power version. I cannot confirm this yet.
The change occurred around 2006 I think.

Thanks for the bolt location file.

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Larry, I see you have the RX8 rear end housing extra bolt hole
in there. Did you digitize an RX8 end housing. If you are confident
in this location no need for us to reinvent the wheel. Looks good to
me. Can you or Jeff send me a thin steel (low expansion) metal plate
with a large (13 inch) hole in it  to clear the starter ring gear that I can
use to check the fit on a real RX8 engine? Perhaps Mazdatrix
has a late model RX8 auto tranny version or even a RX8 manual tranny
version I can check it against. Mazdatrix is a lot closer than Escondido :)

Jeff please check these dimensions against the last 3D I sent
for the extra RX8 top bolt hole. I have lots of confidence in what
Larry does.

Paul Lamar