Hey everyone , question about nerf bars(step bars).i have a 01 ram 2500 quad cab the vehicle the nerf bars i want to buy are off an 07 2500, quad cab,they are mopar with the ram head on the step, they are the oval kind 6ft. Long, has brackets but no hardware they are used. They should fit right? Do they mount on body or frame? Any help would be greatly appreciated.