The external thread size and pitch for the inserts is M16 x 1.25. It would match the standard spark plug size of 14mm x 1.25 pitch.
Powerbuilt, 14mm Spark Plug Thread Repair Kit, Model # 648421

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- Repair stripped 14mm spark plug holes
- Precision built to meet or exceed ANSI standard
- Strong and dependable to last a lifetime
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