New to me 1971 Polara 2dr custom

Hello all, I’m the green new owner or a pretty basic ‘71 2dr polara. I’m curious if there is anywhere or any recommendations on where to find rocker panels? It looks to be solid under the car but there is rust in the outer rocker skins. Is that something I’ll just have to have custom repaired? Looking for pointers. Also, headliner source along with seat/carpet? Thanks, looking forward to the adventure!

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Author: acltendon