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Just out of curiousity, which parts are you looking for?
I had a Mazda trans eat itself about a year ago and it was cheaper to throw it away and replace it with a NP435.
The Mazda 5 speed has vertical and horizontal stripes on it wherease the ZF used mainly in the 3/4 and up has I believe diagonal stripes. Your code would also be M on your door which is the M5OD-R2.
With the engine/trans combo you have it's sure to be a Mazda 5 speed. If your 1st gear on take off isn't similar to the granny low four speed then it's a Mazda, if you can take off with no problems in 2nd then it's a ZF.