GXOAP-9147 is an overrunning alternator pulley for catalog-listed Chevrolet applications. Catalog technical data includes OD1 63.5, OD2 55, W 38.5, R 6, ID 17, M M16, CLOCK CW. OEM/cross-reference numbers are listed for Valeo, Gm, Litens. Alternator references are listed for Gm, Opel. Review the catalog fitment and reference numbers for compatibility before ordering.