5 speed aspire to mazda trans parts interchange

[iceracerdude]

I need parts for my 97 aspire 5 speed trans. More specifically, the diff pinion gears. I know the ford dealer can't get those parts anymore, but I believe the mazda dealer can? If so, what is the aspire trans designation or comparable mazda trans/car designation to tell the parts guy?
sign me: a little ground up