Mercruiser 4 cyl. model 110 (2.5L)  1963-1966, Delco Ign., S/N 1537370-2044033, original part number 84-813720A5 / 84-816761Q5
                           model 120 (2.5L)  1964-1986, Delco Ign., S/N 1666601-0B531853, original part number 84-813720A5 / 84-816761Q4
                           model 3.0L,LX (181)  1990-1991, Prestolite Ign., S/N 0C856559-0D504541, original part number 84-813720A5 / 84-816761Q4
                           model 3.0L, (181) 1987-1989, Delco Ign., S/N 0B450801-0C856558,  original part number 84-813720A5 / 84-816761Q4
                           model 140 , 1968-1986, Delco Ign., S/N 2508261-0B450800, original part number 84-813720A5 / 84-816761Q4
                           model 3.7LX (224) 1988-1989, Prestolite Ign., S/N 0B775249- & up, original part number 84-813720A5 / 84-816761Q4
                           model 180(224) 1987, Prestolite Ignition, S/N 0B436391-0B775248, original part number 84-813720A5 / 84-816761Q4

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