I buy a lot of stuff from https://www.lmctruck.com/ Everyone sells the same Korean panels, I believe. You can also find them on Ebay. I bought a lot of weatherstripping off of Ebay as well. Classic Industries as well. Eckler's is good too. Oh, and https://www.motorcityk5.com/ - think that's a small shop and the customer service was really good in my case.By chance do you have a link for that web site?