Didn't see a count number for 20" painted aluminum wheels for non RS models. The RS painted aluminum 20" is in midnight silver finish while the non RS 20" painted rims are bright silver metallic. Seems I see a lot more of the midnight silver around the streets than the bright silver finish as most are RS package models down in my neck of the woods.
The bright silver finish 20"ers on my wife's Camaro is the only somewhat less common feature.