These are 1970-1973 Z-28 – Chevelle 5-spoke steel wheels I bought on eBay. They are 15″ x 7″, with 3-3/4″ backspacing. These are the early wheels, with an oval valve stem clearance hole. I shot-blasted them to bare metal, and then had them powder-coated by Toefco Engineering (Motorsports Division) in Niles, MI. The color is Dark Grey / Charcoal, color # RAL 7024.
The trim rings (GM part # 3984524), and the center caps (GM part # 3989479) were purchased at www.gmpartsdirect.com. If you know your part #, this site even with shipping will beat the GM dealer’s wholesale prices.
The tires are BF Goodrich Radial T/As purchased at The Tire Rack. I saved myself the shipping cost, as their main warehouse is only 10 miles from my house. The fronts are 195-60 x 15″. These clear everything nicely, turning from full left to full right with no rubbing. The rears are 275-60 x 15″. I had to use custom-made 1/2″ thick spacers in the rear. The screw-in lug nut studs are 1/2″ longer than before installation of these wheels because of the spacers.