[Mieser3]

I did some research and it appears as though the trim rings were optional on 1957-1959 half ton trucks and were standard on 1958-1959 Cameo trucks. My dad has had these hubcaps and trim rings since 1966. He purchased a 1966 Chevy truck that had these on them and removed them and put a set of chrome wheels on the truck at that point. He's had these collecting dust since then. He bought the truck from the original owner when the truck only had 150 miles on it. I'm not sure why the truck had these trim rings on it as the hubcaps are correct for a 1966 Chevy truck.