Looking for a spark plug

Hi All, I have a reproduction Thomas head with 14mm base spark plugs. I have a hankering for a plug with the removable top to replace with a rahja terminal and a brass nut. Does anyone know of any plugs available? Stopped at local parts store and everything they had were your standard non-removable top. Parts man was checking in book to locate, told him to not waste alot of time, maybe he could check some more when he had a slack period. Thought I would check here as well.

Thanks!
 
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