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1987 GMC R2500 V6 4.3L 12si High Output Alternator Bass Knobs This is a direct fitFitment: This is a direct fit high output alternator for the 1987 GMC R2500 4. 3L. 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 selection of