you might give these guys a call - no guarantee they have em in stock (lots of things they list aren't in stock), but they do still list 6" wide 6 lug on 5.5 bc 71+ wheels. They do exist, I've been to their warehouse when I lived in CA - for hubcaps. But they do wheels too. Worth a call.
https://www.originalwheels.com/chevr...0rims-1972.php