Search by number: 1991 GMC Full Size Pickups 5.0L 8 Cyl Starter ProAmp 6416 $99.00 each OPTIONS: 4WD, wo/124 Amp Alt ProAmp 3733 $100.00 each OPTIONS: 4WD, w/124 Amp Alt, Opt ProAmp 3510M $110.00 each OPTIONS: 4WD, w/124 Amp Alt, Std ProAmpN 3510MN $85.00 each OPTIONS: 4WD, w/124 Amp Alt, Std ProAmpN 6416N $125.00 each OPTIONS: 4WD, wo/124 Amp Alt ProAmpN 3733N $192.00 each OPTIONS: 4WD, w/124 Amp Alt, Opt IMI IMI102N $249.00 each OPTIONS: IMI High Torque