Hello Sonny,
Yesterday I was given several new Reflex T-6 spark plugs. I inquired with Lanning Barron about the application.
"These are late 30’s- early 50’s era 18mm plugs , many applications, most common flathead Fords"
lanning baron <sparkpluger1@gmail.com>
They have 18mm x 1.5 threads. I sent him Pics.
They are yours for the asking and my shipping cost.
Rankin