Customs Help from Buick Guys

Going to go look at a 1955 Buick Super hardtop. Looking for some info on any trouble spots they had. Do-s and don't-s. Up-s and down-s. It's a project for sure. I know it needs some rocker work and lower rear quarter work. Are there any production repair panels for that car I'm not finding on line?
Any info is appreciated Thanks