As the old ones become so brittle, You'd be better off buying some new aftermarket ones. Lots of outfits sell these and Dormann for one makes them...My local Napa had them hanging on a rack.
If you have found a sources for these please post up some additional information, such as part numbers. I searched high and low and wound up buying some for a 67 GTX which had to be belt sanded to reduce the height.
