What are these for - '73 disc brake :

I'm wondering about those myself. They are in my disc brake hardware kit as well and I'm drawing a blank. Must be some sort of anti-rattle piece, but danged if I can remember where it goes. Don't remember ever putting them in place on a brake job. You can use the anti-squeal sauce if you want, but you can get the same result with a layer of duct tape on the back of the pads. That's all I've used for years.