Brake caliper question

Hello everyone, I am currently doing my brakes this evening my 2017 TRD Sport 6 Speed and I just got off the passenger side caliper. There are these metal rings on the piston but I don’t seem them in my dealers diagram. Are these aftermarket? It had aftermarket EBC’s when I bought it. I did notice it was missing the factory shims between the pads. Could this be those replacements? I bought the shims already so I don’t want to double up if I don’t need to. Thanks in advance

 

^Yep, those circular shims are aftermarket. If you new pads came with shims, these could be discarded.

 

I have EBCs. Those are the shims. The rings are just fancy ones that go in the piston ring where it hits the back of the pad you can take a little sand paper to them and then add a little brake grease to them.

 

Ive never seen that before, must be an aftermarket caliper thing

 

Thanks guys, bought the Toyota shims so I’ll go ahead and discard these. Appreciate all your help