Hmm. Ran across these "bushings" that some of the resto websites are peddling. What's the purpose? I looked at my car and didn't see any of these white nylon bushings (T-tops lock in tighter than Dick's hatband), plus, can't find them in the parts book, and the NOS pieces I have don't have any in them. Parts book calls them a "guide" and they fit all G-body T-tops. Am I missing something here? Literally and figuratively? Has anyone actually used or needed these? They say they're for eliminating T-top rattling. I'm failing to understand this.