What hubcaps are these for???

[azlamm65GMC]

I have been restoring a '65 GMC 1/2 ton and the guy I Purchased the truck through had two of these style hubcaps on the floorboard. I have been looking at other threads and posts and still not completely sure. I have read some that say these are the clip style and one said these are for different style wheel bc they don't fit anywhere close to the Original wheels that are still on the truck. I have two of these style hubcaps and one regular one that's a little dinged up I'm going to get rid of so if anyone is intwrented PM.