You will want to keep the driver's side rear manual axle to use on your swap. The manual transmission axles are beefier than the auto axles. When installing your drivetrain, locate the driver's side transmission output shaft in exactly the same position as the Fiero transmission output shaft. The Fiero manual trans driver's side axle will then be a perfect fit. Depending on which trans you are using, you may be able to use a driver's side manual transmission axle on the passenger side and only change the inner tripot and spider.
By the way, all Fiero manual transmission axles are the same, other than the difference in length from driver's side (short) to passenger side (long).
Good luck with your swap, and keep the fuel injection (saw your other thread).
Posts: 14438 From: Calgary, Canada Registered: Nov 1999