I wasn't aware that fenders were restricted, but I've also never seen anyone try to order them. Mostly I've seen people buying things like charge ports, either due to physical damage or potential upgrades. Interestingly, these aren't considered high voltage and are unrestricted, though a few people have had issues with their local service center.

I agree with you, though. There should be a way to be certified independently to buy all parts (HV or otherwise).