2003 Silverado SS Wheels and tires

[chevy71super]

I have 4 - 2003 Silverado 20 inch factory SS wheels, silver not chrome, that I took off my SS at 2,500 miles. The tires and wheels have been stored indoors since they were taken off. The wheels are in excellent shape, no curb marks on any of the wheels. There are a couple of minor surface scratches on two of the wheels. The scratches are not to the metal and can probably be buffed out. (From storage.) The center caps are perfect and I have the lug nuts. I realize the tires are old. No cracking but I wouldn’t recommend driving a 100 MPH on them.

A couple of questions. Will they fit a 67/72 pickup (6 lug)? What should I ask for them? Thanks. Doug