I've had tire repairs/replacements done on RH5 wheels as late as Spring, 2018. I don't know if DOT regulates RH5's or not, but I have had tires repaired/replaced at three different tire shops in the last couple of years. Replacements for RH5's are pretty limited here, but I still have a couple on my '72 C50. I have had one shop refuse, but the other three shops didn't care.
