valve cover openings

What kind of valve covers are they? I've got a nice set of the early M/T cast ones that are raw, with none of the caps or grommets that I'll be needing eventually. Not sure where or how to find them.

I had a heck of a hard time finding grommets to fit M/T valve covers. I don't remember where I eventually came up with them. - But today I was looking through a McMaster/Carr catalog and it seemed like they handle almost every conceivable grommet size. They're an industrial supply outlet.