Complete set with 4 Q-tower and 1 pair of 58” cross bars. Q-Tower installation https://youtu.be/vYBmGhqYDH4 Pls see link above for installation. It’s a complete roof rack system which requires a set of 4 Q-clips (vehicle specific) which Yakima no long produced. Shop online for a set of Q-clips that would fit your vehicle. Or Rack Attack in Victoria maybe able to guide you to the right direction.