The recommended treatment for the rubber seals and weather stripping at this time was to apply a coating of glycerin. You might get a small bottle and try it on a piece of weather stripping that looks like it might respond to see what effect it has on bringing it back.

This old weather stripping just soaks this stuff up so put it on slowly and let it soak in.

And it might not work. But if it does use it anyplace you can as it is easier than installing new rubber. The rubber compounds dry out and somehow the glycerin restores the 'liquid' content to the rubber.

This little tip is going to be like a lot of things on this car: You will not know what really works until you try the thing and see if it works.

And hang on to that battery hold down frame in the trunk. These are almost impossible to find since so many of them were just eaten away by the battery tech of the times.