BSome
Super Member
I think hubcaps were provided and wheel covers were the add on or luxury.
When I hear "hubcap" I think of the 6" diameter cover for the lug nuts only. Wheel covers cover the whole steel wheel.
In my day it was sporty to ditch any wheel cover favored by grandpas everywhere, in favor of the "baby moon" style hubcaps.
I will say your are correct. However, at that time here in rural North Carolina the 2 terms were used interchangeably. I can promise dad wasn't going to waste his money on something as highfalutin as wheel covers. I had to leave the room once when mom told him he was so tight he squeaked when he walked. I didn't want to get in trouble for laughing.
I also remember the 2 piece version that had the hubcap and separate trim ring around the outer part of the wheel rim