Yakima Bar End Caps - Set of 4 Yakima end caps are designed to keep debris and weather out and protect the longevity of the rack system. End caps for extra long 86-in. crossbars are also available. The end caps are made for crossbar sizes 48, 58 66 and 78-inches. End caps are a finishing, attractive touch for the Yakima roof rack system. Yakima end caps come in sets of four.