Need info on loose 74 caliper

I think your right about the rubber bands because I have not seen them at all. And the small anti rattle clips for the pads are working fine as well as the larger retaing spring clips (they are bent and tight) and the bolts are nice and tight. Also you mentioned tweaking the tangs on the backing plates and that has been done quite thoroughly. And how are the rubber bands supposed to work and be installed. I'm guessing you can't get them alone so I'' probably need a remanufactured caliper. Right now I can grab the caliper by hand and rattle it while its all assembled. It's definetly not the pads (triple checked them). Can I get away with regular rubber bands, if so what size?

Thaks for all the help you guys!