I think 3/4 and 1 ton hubcaps are the same larger size, about 11 inches across.
I’ve seen both Chevy and GMC reproduction caps, the gmc are less common.
Finding the chrome gmc originals is rare
Originals are two parts, metal inside with a shiny cover on top.
If someone make a good reproduction please let me know
FYI I have a set of damaged original “chrome” GMC caps for a 1ton
Only one is in decent condition, the skin is polished stainless steel, I can take photos of it if someone needs a reference for what an original looks like.