Hey Roger
I am not sure it makes sense for someone to ship you a transaxle just for this. Since they are only $200, and in the Fiero world , the demand is clearly toward the 60 deg V6 configuration, it may make sense for you to grab a local transmission yourself and just make the brackets. I am sure they will sell, as there are far more 2.8/3.4/3800 Fieros out there than ever will be with Ecotec motors.
Why not just go to a local junkyard and grab one? Mileage doesn't even matter, since you only need the case. Up to you, but this is what I would suggest. I can't imagine someone buying and shipping you a transmission just for this,
Good luck!
[This message has been edited by cam-a-lot (edited 10-23-2021).]