Back inna day Shimano sold a replacement bushing kit for these & the XTR brakes. Either one worked on both & I even worked in shops that had these kits in stock but they didn't sell because the brakes worked so good that they never wore out until the last 5-10 years & by then you can never find the kits cause shops either binned them or donated them to community shops. I dunno where they all went. I has a pair of the XTR brakes with worn out bushings & kept holding onto em' thinking I'd come across the kits but I ended up giving them away to a staff member. But FYI a zip tie around the parallelogram/slash bar thingy keeps them quiet but look fugly!