Sierra International 18-5107-1 Ignition Module The Sierra 18-5107-1 Ignition Module 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 Sierra product meets or exceeds the original equipment part it replaces. Sierra Ignition Module Fits 4, 6 and 8 cylinder engines Sierra part number: 18-5107-1 Interchangeable with the following: Crusader 7243110, GLM 73190, Mallory 9-29800, Mercruiser 811637001, 811637T, 811637, 802464, 850487, 811637002, 804412, OMC 3854003, Volvo Penta 3854003