Be careful of the repro "deep" caps. I bought a set of these from Ground Up a year or so ago and the ID was too small for the GM "SS" round emblem to fit properly. I sent 'em back and restored an original set. Maybe the die has been fixed, but I doubt it.
I suppose you could cut the emblems down to fit if you're not too picky......
Look at photos of these in some of the seller's catalogs. You can see the "SS" emblem is concave around the edges where it was pushed up due to the tight fit.
Dave