Don't have on my truck but bought a vintage travel trailer some years ago that had the outer ring. Shoulda probly just replaced them but found a truck tire shop that happily sold me tires, tubes and the guys didn't flinch about putting them on. I sat in a greasy chair and watched them do it right on the ground in front of me. They had an old piece of carpet on the ground to give them purchase when they moved the wheel around. They've been doing this for years and probly just knew instinctively that if the rings looked like they didn't belong to the wheel or there was too much rust, they wouldn't move forward. They didn't look for markings or make any fuss whatsoever. No special cage. Just old fashioned grunt work. Illegal? Probly not. Dangerous? Probly.
