I can't imagine door leaks weren't common from the beginning, water from the windshield runs right into that vertical jog on the door and it's quite uncommon to find doors that fit real well there, not too mention that the rubber is very easy to crush so it doesn't fill the gap well ... just look at how commonly the originals you see have rotted steps, hinge pockets, and floors where the front cab mounts are .... remember these trucks were cheap consumer goods, not meant to last more than maybe 10 years, used hard by tradesmen and farmers, what farmer cares if there's a bit of water under his rubber boots?
Bill
