I have seen the " Empennage control covers " at the factory on all the aircraft. I could not remember seeing them with my build parts. I went to the construction manual in drop box and found the parts in the finishing chapter. The parts are RF-SKN-008-L-A and RF-SKN-008-R-A now called "Empennage Control Cover". I checked my packing list to see whether I had ticked it off when I first received my aircraft. These parts are not listed on my early edition packing list. I decided to have a good look in my box for the parts and found them in a bag with the " Cover between wing and fuselage"skins. Mine were originally called " Cover for vertical stabiliser". They are attached to the Vertical stab. and Fuselage with rivnuts. I have installed the rivnuts on the vertical stab. as per the instructions, but not the fuselage, no mention in my manual. All OK, had to remove four rivets ( no big deal ) and I will install four rivnuts. Glad I found this before paint, so Sling builders, keep an eye out for " Empennage Control Covers ".