I am saying this with just anecdotal evidence. I have purchased these panels from Classic, LMC, and JC and I get the same quality. My assessment is they fit fine, weld up fine, but they are a slightly thinner gauge than original. I don't know of any vendor (wish I did) that sell the same gauge as original. Leads me to believe they are all getting them from the same supplier. If I am wrong, please clue me in for sure!