Found a truck with 6 lug PY0 prototype wheels!

[AK 99]

Wow! So those are actually real wheels that were offered by GM? I have never seen a set of those 6-luggers.

 

[HotWheelsBurban]

If the center of the wheel is like the 8 lug PY0s, the cap doesn't attach to the wheel itself. It's held on by the plastic "lug nuts " on the chrome or black GMT 800 style plastic center cap. IIRC the later style caps will fit--with the correct lug nuts. But not entirely sure, because that project never got completed. Which is why I have a set of those wheels (and no truck to put them on)(unless a 2500 lands in my yard LOL).