New GM 20" wheels. Fit on '73 - '87 4wd???

[Gregsmx]

Does anyone know, or have access to a mole inside of Chevrolet that can scam a specification sheet for the new 20" Chevy/GMC wheels that are now on the market?

Here's a link:
http://www.gmgoodwrench.com/gmgoodwr...20%22%20Wheels

Specifically, what I'm interested in is:

A. will the wheel center opening slip over the Front Dana 44 axle hub (3.5" dia.)?
B. Will the width and backspace work?
C. Will the lug pattern fit?
D. The late model trucks have metric wheel lugs vs. american threads on our trucks. Will this make a difference?
E. Do they make a front cover that is open that will 'shoulder' the Dana 44 hub?

If anyone has any experience with these wheels, or knows who to ask, I'd be greateful!
Thanks, Greg.