Valve cover grommets
Okay before I start these are needed for cast aluminum covers, the holes are 1 1/4" but your standard China jobs are loose, these used Holley covers i got had one grommet in the hole (see pix) and it was tight and even looked Mopar type but different. And one know of a good quaity grommet for PVC and breather that are a true 1 1/4".