A friend purchased the OER dash pad for his '69 and returned it almost immediately as the backing was not rigid enough to keep the pad straight and without deformation.
I'm glad I didn't go that route for my cammer. I just went with the pad cover. You really have to look hard to see it's just a cover. But when you try to press on it you can tell right away it's a hard shell. Just Dashes recovers the factory backing. It's costly though. But hearing the OER is crap it may be the way to go.