GM specific parts vendors, links section, here @ the 'Bolt You guys really need to explore the site more often. That isn't a knock on anyone, I'm just saying.
The big parts store chains can usually order things like brake parts, spring kits and rebuild kits for various pieces. The trick is finding the person at the store who knows how to do it.
-W
p.s. Not American Parts Any-longer - so true. sad, but true.