My used SSS strat had felt o-rings underneath the bridge (protects area surrounding those brass? bolts). I replaced them with ring style rubber O-rings (actually 2 per side, one inside another).
What do these bridges come with from the factory? The felt bushings seemed smashed and offered no bounce back. I've seen a YT video where a tech found rubber bushings in a G&L he was working on, but I'm not sure if it was factory installed.
I'm getting better results using the rubber rings, or at least if feels better overall, more smooth. I have flat o-rings too that cover more area, I just have to make the center hole wider.
best regards
Nosferatdude