Curt...I'm finding out your pics are very helpful with what I'm doing on my truck. I've been checking numerous vendors for prices on sheet metal and some catalogs mention "1st" and "2nd" with the part descriptions. I'm guessing it means years. Do you know what that applies too? My truck is a 53 series 6400. I know most cab replacement parts are the same for my truck as lighter duty trucks, but I was wondering if the "1st" and "2nd" applies to my truck.
Thanks to all for the feedback!