Vintage Mickey Thompson valve cover help

[Chevy4Life]

I know someone here will have info on these M/T valve covers I just picked up. I've always liked them and they were on my 68 Chevelle when I was a kid. Getting back to work on "dads" 68 and want to keep things kinda period correct.

My Chevelle covers just had "CHEVROLET" these have the funny "bowtie" which I hate and love at the same time.

The issue is these are drilled for grommets and are 3/8 thick the widest groove grommets I can find are 1/4 which I can make work, but if anyone knows a source for a wider groove Thanks!