Mercruiser: 33-19796, 33-813423, 815427T, 95297, FBPR6HS10; NGK Spark Plugs: 2633, BPR6HS-10; Yamaha: BPR-6HS10-00-00; Tohatsu: 9701-1-1013; Champion Spark Plugs: 327, RL87YC