Is this panel available aftermarket?

I always call them the inner rocker panel brace from floor to frame rail support.
I have some already fully drilled off. This is what I can tell you, the earlier
panels had a small hole in between the no.1 and no.2 formed upright ribs.
I will need to go to the other building and see what we have. I have different
years, but will need to look. If it does not matter if it has the factory small
hole, just let me know.