Might be an Isuzu trans (out of a 4 cylinder), or a getrag from a later model if it was a 5 speed.
Different transmissions have different throw out bearings, mounts, cables, & possibly other dependencies. I searched the tech forum looking for a "how do I tell" years ago & found the cradle pull I purchased way back then was a 4 speed out of an 85 GT, which is why this pinged my radar.
The following threads were of some help though: //www.fiero.nl/forum/Forum2/HTML/125111.html
As a swap, it's also possible it came from another car - Rodney Dickman has a ~great~ write up on such swaps and their dependencies here: http://www.rodneydickman.com/getraginfo.htm
Bottom line, there's differences that go further than you might think... I'd suggest further searches in the tech section, or posting pics of your transmission (close-up on clutch slave, cables & mounts) to the tech section to determine what you've got so that you can better acquire the right parts to get your project back on the road...
Best of luck,