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1977, 1978, 1979 Firebird, Formula 403 Air Cleaner - $200 (san anselmo)
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The Trans Am uses this air cleaner but I think the lid is a smaller diameter.
May also work on other late 70's GM cars with the 403 Engine.
Good overall condition.
The vacuum diaphragm was tested and works that control the Thermostatic Valve.
Air cleaner lid top could use a repaint.
The gasket underneath is in excellent shape.
It looks like one port is broken off on the ported vacuum switch.
The Crankcase vent elbow is missing part of its end.
If its posted its for sale.