The two like parts are the stabulator slot covers ie. they attach to the stab to cover the "hole" in the fuselage. They don't fit very well and I don't use them for fear that they will jam the stab by catching the edge of the elevator servo hatch. I'd rather live with the gap there, which is not that noticeable to me.

The other piece, I'm guessing is CARF's attempt to replicate an antenna blade.

MIke