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If you already own a GM Type II power steering pump (with a shaft OD of .664-inch), then Vintage Air does offer a kit with it deleted (PN 174017, $2,450). We already owned a pump from Detroit Speed Inc., so we just installed the Vintage Air pulley and mounted it using the two supplied 5/16-18 x 2.75-inch stainless bolts. Note: You must use the proper tool to install the power steering pulley as per the instructions. If you attempt to press the pulley on the shaft with a standard hydraulic press, you will ruin both components!