Vintage plates for motorcycles? I've asked about this here, and they tell me no.
Are they MC sized plates?
Yes, they are MC sized plates. If it would help you at your Moab DMV, I'll take a picture of them later.
I just got off the phone with the state DMV call center. They said that I shouldn't need an inspection to renew my vintage plates; however, they admit to a glitch in their system, which is why mine is requiring a safety inspection. My other two vintage vehicles will come up as requiring safety too, which is going to be a PITA, especially for my rockcrawler. They suggested doing one of two things:
First, I can tell the DMV personnel that I'm not required to show a safety inspection, and if they object have them call Branch Support. That sounds like fun, but with one of the professional Tooele DMV employees it might be okay. I'll definitely avoid the one on the right!
Second, get a safety inspection and renew the registration. I presume from my conversation with the state that this is a one time thing, and wouldn't come up again. The state guy said that you are required to have a safety inspection in the vehicle always (even vintage vehicles) in case you get pulled over, but you are NOT required to show one to register the vehicle initially.
Anyway, thanks for the help everyone.