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Guys,
I'm looking for the piece that bolts to the stock cat, and to the bracket with the rubber on the trans crossmember. Previous owner welded a bunch of crap together on mine.
The crossmember side bracket is TTA specific the cat side is a standard 3rd Gen (not all) bracket with some work done to it but you would need to compare and see what they did exactly (most likely just cut the opening different where the cat attach).
Let me know if you need some pictures of the bracket assembly to help find one.
If they can use a modded part from the standard single converter on the firebird, Walker has hanger pt# 35245. I looked it up for a 88 firebird with a 5.7, they of course don't have anything listed for the 89 TTAs hanger.