I've been working on a 65 & also noticed the lighter repo parts. Used mic's and found the thickness to be very close to the same, so I'm thinking the China aluminum is a much lesser grade than what was sourced back in 65 in the US. The repo also dents much easier than the original trim.I bought mine thru GrdUp / seemed okay but it did not weigh as much as the Old one / thinner material ??