Auto Metal Direct. They have the best fitment, least issues. Used them on my Camaro (in avatar) They made dedicated ones for RS.
Best Deal @
www.restorationperformance.com. Can drop ship them to your door or shop.
200-3070-L $251.99
200-3070-R $251.99
Truck Freight to Business $139.00
Total = $642.98 (I also heard they had a 5% discount but it may have ended on the 31st) but you can ask.