Firebirds used the A6 compressor. The manifold/muffler assembly bolts to the back of the compressor and is also held by a bracket at the front. The port on the left (closest to the engine) is the input, coming from the POA valve. The outlet feeds into the muffler and then on to the condenser. There is an overpressure relief vent at the back of the compressor, and the high pressure port (schraeder valve) on the back of the muffler. At the front is the pulley and the electric clutch.
The bulge on the bottom of the compressor in the second picture is the oil sump and the bolt is a drain plug. This should not be opened if there is still refrigerent in the system.
The third picture shows the pivot bracket part number is 9789228.
The fourth picture shows the original label on the compressor. Firebirds took 3.75 lbs of R12.
