suburban passenger rocker question

[Rust hole]

hello all, Having an issue with installing the passenger side outer rocker. I've got the inner rocker and floor fixed( i think) but the outer rocker kinda sux! is there a better one on the market or do they all need to be modified to fit? Was the factory one modified? I got the 3rd door one from the same vendor and it dosent look like its very good either. starting to miss replacing quarter panels!!