Maybe this is too obvious, but since you're doing your own powder coating, why not buy some high temp tape from one of the suppliers and make your hardware match the parts they go to?
I don't actually do my own powdercoating a local place called DUN-RIGHT QC coatings(Shelby Twp., Mi.) do my stuff can't say enough good stuff about them, but the small stuff is what I'm getting into now... i.e. screws and clips, R/T specialties has been a big help but some things I just can't find new or it isn't so important to have new just want it to be clean thats all.
