mopar performance valve cover grommet?

I did a search and came up with several results, but nothing definitive. Summit and jegs sell grommets, mopar sells grommets, but then people say use one from a chevy and I have no idea which lol

Anywho, I've got the mopar black ribbed valve covers (a/m part) and need a grommet with a good enough lip to cover the hole and still let me slip a pcv valve in there. Any ideas or concoctions you guys have come up with? I've currently got two grommets trimmed to fit and if I look at it wrong the damn thing slips out.