Charley
If you are looking to make the Shakers functional or they are tired and don't work properly, I found this web site. It may help you or who ever is redoing the shaker assemblies. Hope this helps:
http://www.pontiactransamshakers.homestead.com/
Looks like a good solution that has a factory correct look. Thanks for sharing the pix of the collection and the Pontiacs.