Sierras 18-5386 Distributor Cap fits GM in-line 6-cylinder engines with Delco conventional ignitions. It is interchangeable with CDI E64-0003, GLM 71530, Mallory 9-29407, Mercruiser Stern Drive 33765, 33765T, and OMC Stern Drive 980152. Each Sierra product meets or exceeds the original equipment part it replaces.