1976-1980 Chevrolet C20 Suburban V8 6.6L 12si High Output Alternator Pulley:Double V-Belt Pulley but if you're looking at

but if you're looking at modifying it down the road (winches/lights/etc) and want to future proof

This is a direct fit high-output alternator for the 1975-1984 Chevrolet C20 4

which causes it to spin faster than a larger pulley

This is a direct fit high-output alternator for the 1990-1995 Chevrolet K2500 5

it is required to install a 1/2" - 1" shorter belt

1976-1980 Chevrolet C20 Suburban V8 6.6L 12si High Output Alternator Pulley:Double V-Belt Pulley but if you're looking atFitment: This is a direct fit high output alternator for the 1976 1980 Chevrolet C20 Suburban 6. 6L. 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