Originally Posted by Brandon91
For some reason my plug is not the standard size.. It's M 12.25. Should I go with 12.50?
Then you may already have an oversized plug, which is not a good thing.
See if they have an oversize listed for the size you have.
I'm not sure if the M12.50 will be right or not.
The next size up in SAE thd is 9/16" x 18 THD.
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