I think you can buy tail light mounting nuts from Ricks, NPD, Classic, etc. that will cut their own threads in the studs when you thread them on. With my bezels, somehow I ended up with two that didn't match, one is like your OER and the other is a Classic Headquarters. The Classic Headquarters one comes threaded with the proper style nuts, the other I intend to replace, so I just used some nuts & washers that happened to fit and threaded them on, and it seems fine.