The stock wheels off of a 1960-1970 Chevrolet/GMC 1/2 ton truck should suit you. (in 71 they went to 5 lug on 2wds, but 4wds still had 6 lug). They are simple steel 6x5.5" 15x5.5" wheels and will accept beauty rings/baby moons.
Here are the wheels on my 67 with the original dog dish caps
Only shot I have with the caps off
The 2wd wheels are narrow 5.5" wide, the 4wd wheels were available 7" and even 8" wide in later years, but will likely stick out too far.