As per that blog:
"Yeah, those are RS Watanabes! Arent these vans some weird lug pattern? I wonder where they found the wheels for such a crazy lug pattern. My guess is re-drilled wheels."
I think they are 5 bolt 5 inch circle. The wheels look like british minilites, or styled like them.
I think that look would be cool on a 77 dodge tradesman, was never a fan of the las gen ramvan nose and tail. Its funny tho i think the dash is the same from 78 all the way to the last of this bodystyle.,
Always thought the sprinters were ugly, but they look better than the fiatvans we have now.