I am not sure of the source but mine were the gold anodized or coating that were the factory looking ones.
The rears were easy the fronts needed some fitting but not a big deal, I got mine to fit with a real nice tight look.
The forward flange that goes to the cars frame rail had to be re bent about a 1/4 inch inboard so it fit or it was too big to slide up. I also remember having to trim a bit at the front edge the welds to the rocker panel side.
But after some massaging it looks better then Factory.