Hi everyone, new member here.
I am getting ready to do the brakes on my 2016 Mazda 3 2.0L. I ordered this shim pad set B4Y0-33-29ZB and I have a question about the parts. I don't show the clips in this shot, but I don't understand why there are so many parts.
This is one pad side shown, there are two of each of these in the box.
Part A is shiny both sides.
Part B is shiny one side, matte black other side
Part C is matte black both sides
Part D is shine one side, matte black other side.
I all the videos I see people changed the brake pads on this vehicle, It only looks like they use part A and D. Do I need to use either B or C or both B and C?

 

shims