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The previous owner lost the lid to the airbox, the stud or bolt or wingnut or what-have-you that holds the can in place, and the throttle body worm clamp. This is what I have. I need whatever is missing:
You'll want to stick to parts from 90-92 if you want to be sure. 87 still used the 85-87 can setup with the plastic lid. Some 88-89 cars used then bale clamp on lids.
The tb boot clamp is the same as 85-89 Camaro, and 90-92 Firebirds with TPI. The rubber rib that the clamp straddles is different on 85-87 Firebirds, so the clamp doesnt interchange. The clamp sold by the dealer towards the 2000's is just a typical large round hose clamp. I'm not sure if the 88-89 Firebird or 90-92 Camaro used the same clamp or not. Been in your shoes before, it was easiest to just buy another setup that wasn't missing pieces.