Trying to find an obscure valve cover grommet for PCV

Today's discoveries.....

PCV 1.jpg

Four PCV valves at hand, the steel one is what was in the Dart 360.

PCV 2.jpg

The plastic ones all measured the same, as was mentioned here....

PCV 3.jpg

Since I already had the .75 valve in the car, I bought a few grommets:

PCV 4.jpg

All three have a center hole approximately .75 but the outer hole varied a bit.

D 1C.JPG