I have the mopar performance big block cast valve covers with a twist on hole and knock out spot on each. I am installing a m/e Wagner Pcv valve in one of the twist on holes. It needs 3/4” id. Does anyone know which grommet with that id also has big enough diameter to seal twist on tang cutouts also. I read a review of Ford grommet M6892F working well on the mopar covers. but Not exactly sure of thickness of groove needed either, covers are an hour away so I can’t measure them right now but want to get parts ordered. Pcv will go on rear passenger side, this just pic of the actual cover for reference. Thank you