passing this along so that someone can find this information when needed.
4T65E: (Not the HD trans) (Not the HD trans)
Drivers side: Try to install an automatic drivers side axle first. The auto trans axle stub will fit into the drivers side of the trans of the 4T65E.
Passenger side: A manual trans tripot (passenger side) will fit into the automatic trans. I didn't think it would but is does. This is a huge help becuase you can use the tripot end off a stock Fiero manual trans axle. You may be able to use a manual side (drivers axle) like I did, but you will have to try it first.
The most important thing with this post is that I confirmed that a passenger side, manual axle tripot will fit into the 4T65E passenger side. So both the driver and passenger side tripot ends can be sourced from a Fiero. The hub ends will be Fiero. One (or both) axles will be Fiero.
Hope this helps.
[This message has been edited by qwikgta (edited 09-11-2013).]