Before buying, confirm your spark plug thread size (M12x1.25 or M14x1.25) and confirm you have enough access depth to run a tap in the spark plug well; clean and dry tools after use. Spark Plug Thread Repair Kit M12x1.25, 11 PCS Insert and Tap Set, 10 Inserts + 1 Tap, for Cylinder Head Rethreading, Cars Trucks Generators.