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This is a GN1Performance "4 PIECE BILLET ALUMINUM PULLEY SET" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. These pulleys are CNC machined with a high polished finish. The kit includeds the crank pulley, water pump pulley, power steering pulley, and last but not least the alternator pulley. Not only do these pulleys look very nice, but they are also extremely light weight!