These are the factory "Black painted aluminum - 4' ' oval tubular side rails" p/n 82212130.
They are quite narrow, I put my offside size 11 1/2 on sideways to enter and use just my heel to exit. Is easy to miss and then you just slide out.
Take about two hours to mount, I put together some notes, see here
ps I am of the "minimal chrome" school. Side and tail trim is needed to break up the slabs but grille is a bit much. Working on thet but $676 for the SRT8 red grille is right out.