Replacement brake shoe set.
Disassemble the screw above the brake show by using allenwrench (A) and socket wrench (B). Push the screw out and remove the brake show from the outrigger. Put in the new brake shoe – its direction is not relevant. Tighten screws. That's it!
Check the proper assembly of all components and check brakes by skiking on safe grounds. Adjust the brakes if necessary. Then use your skikes again.