I take it you have a CV boot torn? or is it the the diff?
If you mean the axle/CV:
I would suspect your is a Old style like mine. The inner attach flange at the diff hubs are not as thick (compare the old and new pic on the Backdraft site and you'll see what I mean) and the axles themselves are (most are, not all) fatter in the center section (hollow).
You can't go to the new axles unless you change out the outer hubs (splines are diff)
BMW E30/E36 CV Joint, Boot and Axle Replacement | 3-Series (1983-1999) | Pelican Parts DIY Maitenance Article
Pelican Parts
I'd recommend replacing all the hub bolts and axle nut while your at it.
Also mucho cheaper at NAPA (use a 1993 325is)
https://www.napaonline.com/napa/en/s...tForm-savedveh