The tin bracket with the stud bolts through the frame behind the brake pedal below the swingarm. It uses a small acorn nut to secure it. Pretty sure it has to be installed before the swingarm is put in place and it serves to guide the drain tube from the vapor canister under the battery box around the leading edge of the swingarm. The drain tube continues to the rear and is secured to the muffler bracket.
I don't recognize the other two pieces, they might be for something else altogether.
