Well, thats not esxactly a grommet.
Its a custom metal eyelet thats riveted on, and rivet pulled thru
Probably need to remove old rivet, and peen new one in place with washer backup.
Solomon might send you a new pair. Worth try.
I got boots replaced by Rocky once when soles failed out of warranty.
Lots of ways to permanenbtly fix, that just look bad. Wide variety of rivet products out there you can buy. Looks like gunmetal.