Exhaust Manifolds - Performance "D Port" - Pontiac 69-79.These are SPECIAL ORDER ONLY average time for supply is 14 days. This is the factual 68 72 GM A body Ram Air III "D" Port set.. that can be installed in the 70 81 Firebird Trans Am series with a PONTIAC engine. Again these manifolds fit any 69 79 Firebird with a Pontiac V8 (not Olds or Chev.. just real PONTIAC) .. and D Port Heads. Each manifold comes with steel flange studs and brass nuts. LH Studs number 5 in the heads and two on the flange.. and