Shoulder Srap Belt Covers.

Has anyone got a set or know of anyone who sells these little things. They are the covers that go onto the headliner and hold up the shoulder strap seat belt on a 1970 Dart Swinger. There are two on each side uptop of the 2 door style. I guess they just slide on and clip to the supports on the roof area. One covers where the strap is attached, while the other one is to store the strap away when not in use, and instead of the belt hanging there. Mine have gone brittle and looking to replace them. Thanks ED..