The Sierra 18-5107-1 Ignition Module fits GM 4 Cyl., V-6, and V-8 Engines with Delco HEI Ignition. It is interchangeable with the following: Crusader 7243110, GLM 73190, Mallory 9-29800, Mercruiser 811637001, 811637T, 811637, 802464, 850487, 811637002, 804412, OMC 3854003, Volvo Penta 3854003. Each ignition module meets or exceeds the original equipment part it replaces. Fit specific, check part numbers before purchase to ensure proper fit.