"I may be wrong but I don't think there were any factory trucks back then that had the "beads" on them."
I made this statement above and must concur that Tim is correct. I had forgotten about the one at the front fender. THOSE I have seen.
Tim, do you think GM would not put the beaded stuff on "Fleet" vehicles?? I only say this because I am 99% sure my rear fenders on my panel had only the roofing type material between the rear fender and body. I think I still have a piece of the old stuff and it looked as if it didn't have the bead when I pulled it off.
Then again, I suppose anything could have happened over the past 60 years. I ask because I do know my vehicle was ordered as a delivery panel and used in a family business as a delivery. I'm trying to get my hands on some original photos that suppose to exist of my panel since new, and over the years....but the guy has not called me back.
Thanks for helping keep me straight and for sharing the Master Parts Book.