Premium Replacement Distributor Cap for Mercruiser Inboard Engines with Thunderbolt IV & V HEIThis distributor cap fits GM V-8 Motors with Thunderbolt IV and V HEI Ignitions.Replaces:MERCRUISER Distributor Cap 16457A4MERCRUISER Distributor Cap 43557MERCRUISER Distributor Cap 43557A1MERCRUISER Distributor Cap 805759A2MERCRUISER Distributor Cap 80579A5MERCRUISER Distributor Cap 805759T1MERCRUISER Distributor Cap 805759T2MERCRUISER Distributor Cap 90746A1PLEASURECRAFT Distributor Cap RA108009VOLVO PENTA Distributor Cap 3858975INDMAR Distributor Cap 556345SIERRA Distributor Cap 18-5395CDI ELECTRONICS Distributor Cap E64-0010*ARCO Assurance 12-month part and labor warranty protection  This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.