Am I missing a part?

[SA56]

I recently disassembled my front and rear calipers for powder coating. Its been about 2 months since I have even had time to look at the project. I started putting everything back together today and found out I was missing a part for the rear calipers (at least I think I am). I will post a picture of the part here in this thread. My question is, am I really missing this part or is it only part of one of the rear calipers?

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[cop on my back]

That goes at the bottom of the cylinder with 3 ball bearings in it. As you pull the ebrake, it rotates and the balls push the piston and thus the brake. When you release the ebrake it rotates the other way and the balls go back into the pockets, releasing the brake. Each caliper has 1 of these.

If you forgot that your ebrake won't work.