Delco EST Ignition Module | Sierra 18-5107-1 Sierra ignition module For Delco EST 4, 6, and 8 cylinder distributors Replaces Mercury 811637001, 811637002, 811637T, 811637, 850487, 804412, and 80464 Replaces Crusader R116014 Replaces Marine Power 483002 Replaces OMC 3854003 Replaces Pleasurecraft Marine R116014 Replaces Volvo Penta 3854003 Replaces Mallory 9-29800 Replaces Sierra 18-5106, 18-5107