M14x1.25x15.7mm Taper Seat Insert # 44185 Time-Sert M14x.125x15.7mm Taper Seat spark plug inserts QTY 5 Use with kit p/n 4412 or 4412E by Time-Sert Professional repair insert for a high quality repair commonly used in General Motors spark plug applications 4412E search# B00I1OHFL4 or short kit 4412 Chevy search# B00IZKYTO0 sealer 6020 search# B00IZIBJ04