I restored all of my original trim, But did end up buying the aftermarket center rocker pieces. They look decent.
What I found is they have ripples when you look down them as you would checking body work on a long quarter panel.
But that seems to disappear when on the car because of their low location. You have to lay your head on the ground near
the tire to see it after they are installed.
What I ended up modifying on mine, was removing material on the backside where the rolled over edge hooks on the rocker clips.
They initially would not come down far enough. Not a big deal. Taped up all the edges & just keep test fitting & removing more material.
I used a finger grinder which made the work easy. Much better to have to remove material rather than than need more
One side need more work than the other, so I am going to guess this is a piece by piece situation & they are all likely a little different.