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This is a GN1Performance "BILLET CNC ALUMINUM CRANK PULLEY" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This pulley is CNC machined with a high polished finish. Not only do these pulleys look very nice, but they are also extremely light weight! This pulley does not feature the holes like the other models, it is a solid piece of CNC aluminum.