I bought those exact same lug nuts from another vendor to use on my 1963 C-20, and they worked out great, I am using the newer rally wheels with the center caps, have about 1,00 mile since I put them on. We check and tighten them up before each ride.
Mike

My old truck's still running good, my ticker's ticking like they say it should, I got supper in the oven, a good woman's loving, and even my bad days aint that bad...Yeah, I'm a lucky man!
1953 Chevy 3100 Shortbed

1965 C-30 Panel Truck
1963 C-20 Long/Fleet Pick-up California Black Plate