I got them from Chevy Duty (ClassicParts). I should have taken a comparison picture showing both the old and new in the same photo, but I was in too big a hurry to get them installed!
http://www.classicparts.com/1960-66-...tinfo/03-065S/
American Classic also sells them, but charges more. They also have the best photo of the item:
It's the next to the last item on the following link:
http://www.americanclassic.com/asp/d...ype=to&exyear=