I to have the Cop Rims with the sombrero style center caps.What I did was drill the rims in three places to mount them.I also tapped the cap mounting holes for 1/4" 20 then used stainless bolts.The red rims do look good.
I am planning to buy new tires and wheels for my Dart.What is the biggest 15" rim and tire size for the rear?What is the biggest 15" rim and tire size I can on the Front?