Stainless steel sandwich plate adapter fitting
13/16 UNF which is used on most early model GM 4 & 6 cyl, as well as Buick, Cadillac, Oldsmobile and Pontiac V8’s.
3/4UNF-16 Z9 oil filters.
M20x1.5 Mazda Rotary
They are used with our oil filter sandwich plates for installing oil temp and pressure sensors,
These are high quality stainless steel fittings, strong and reliable