Rocker Panel Question

Was down checking on my 70 Challenger at the body shop yesterday. Got the front lower section of the rear quarter cut out where it was pretty bad. Going to put a replacement panel in but noticed that behind the cutout section it's pretty crusty. May just clean it up with sandblasting but now I'm curious. Is this what's considered the inner rear rocker panel? I spoke with a tech guy at Classic Industries. All he could tell me is what I could read myself on the website, a part description word for word. I couldn't even get measurements. I can find several places that sell the rear inner rocker section but really not sure if the rocker ends at the door line or goes all the way to the wheel well opening.

Here's a picture......as usual any input a big help. I'm learning a LOT!!





Mark
Author: tomps