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1977-1981 Pontiac Catalina V6 3.8L 12si High Output Alternator JS Alternators This is a direct fitFitment: This is a direct fit high output alternator for the 1977 1981 Pontiac Catalina 3. 8L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a separate adaptor plug. One side will plug directly into the aftermarket high output alternator, and the other side will plug into the factory plug. NOTE: If you require charging at a certain voltage setpoint, we offer a