Disc brake rattle

View attachment 1715446510The rectangular anti rattlers in pic can get old. Mine rattled until I replaced them. You can probably bend them or replace them. Rusty's suggestion also.

In that pic are some rubber o-rings. just exactly where and how do they fit/go? anyone got a picture of them where they go? I'm so old I trained on Drum brakes as a kid and then went to work at a dealership before disc brakes came out,then moved to bodywork when they did come out. I've done my brake pads for years without them and never used them and all without a rattle, so are they needed? I tried FSM'ing them but no clear picture.