0311-861824 Aero (OEM) Bent Upper Arm for Easy Cover (54" Aluminum) Item #: 40364 Part #: 0311-861824 This 54-1/8" Bent Upper Swing Arm is a part of the Aero Easy Cover tarp system. Specifically designed to ensure optimal performance, this upper swing arm boasts robust construction thanks to its shape and high-quality aluminum alloy.