The servo covers that came with my Avia did not match my flap servo arrangement. My flaps were on a Y harness so needed identical covers. Topmodel of course supplied 2 pairs of covers. Each pair was for a left and a right. Flaps on a Y needs either two rights or two lefts, or a reversed servo. I made the effort to "remake" one of them to suit because my field can be quite messy and I wished to keep the grass clippings out of the wing, and wanted to shield the horns as well. You're welcome.