Very possible the issue with my originals, as the car was sitting outside and not running for many years before I purchased it. They looked great, but one winter day, the outer shell got hard, brittle and cracked when I put my arm down on the door pull area, exposing the inner foam.Soft feeling original door panels could also be a function of old/rotting foam underneath the vinyl outer layer.. That could explain why the panels on my very low-mileage cars are still very stiff and firm (I also have a new-old-stock 1971 deluxe door panel that is similarly firm), but cars that were driven plenty and exposed to humidity and high interior temperatures and use and-and-and could be compromised and softer. The foam used, with time, eventually begins to rot and degrade. It's just a matter of time factored with environment. Without air-conditioned storage, mine would likely head downhill too.