GXOAP-9166 is an overrunning alternator pulley. Catalog technical data includes OD1 58, OD2 55, W 41.2, R 5, ID 17, M M16, CLOCK CW. OEM/cross-reference numbers are listed for Bosch, Volvo, Ina. Alternator references are listed for Volvo, Bosch, Zen. Review the catalog fitment and reference numbers for compatibility before ordering.