Ok I built my axle for the pass side using a Manuel driver axle and the 97 Riviera pass axle . The tulips fit perfect but the axle is to short I know this cause I see the yoke coming out of tulip when I move suspension. It stays on the very lip of tulip with boot off. I used the inner cup of the 97 Riviera axle cause that's my engine. I used the axle and outer cup of the 87 man driver axle for the outside to complete it. So now I guess I have to remove outer boot and find a longer axle but from what car now cause the fiero man axle is bout 2 inches too short?

Going through this same thing now, using a '95 Riv for my Donor. From my research, the Driver's side Manual Fiero, with the tulip changed with the Donor Tulip, should be used on the driver's side (Not the passenger side). Length is 22 5/8" on stock Fiero Axle for reference. On the Passenger side, the length needed is 25 1/16". On this side, my research shows using the Fiero outer CV, the Inner Tulip from your RIV should work fine, but you need an axle shaft to mate these two up. Most have used one from the passenger side of an '89 Pontiac 6000, non heavy duty. The Cardone PN is 60-1115. At least that's the way I've got it figured out so far- haven't actually gotten to the point of trying it yet.

Here's some links from my research:
https://www.fiero.nl/forum/A...041015-1-041467.html
https://www.fiero.nl/forum/A...041015-2-046145.html

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'87 GT in process!