If you are not able to source GM stock 8 lug wheels, you can always get the Ford van wheels from late 80's to early 90's. They will accept a hubcap. They are 16x7 and they have "Accuride" stamped on them.
Just make sure they are not the metric variety which started around 1997. These rims are lug centric and not hub centric like the factory GM, but from what I have read, a lot of aftermarket wheels are lug centric.
Should be easier to find and much cheaper than the link below.
Dorman reproduces them if you can't find a used set
https://www.summitracing.com/parts/rnb-939-198/overview