Used Thule Slidebar Roof Rack System. Originally bought for SUV which had 4 bike carriers. The slide bar enabled easy access to bike carriers without the need for step/stool/chair. Check the distance between your vehicles rails before purchase. I believe they are the 891 version which are 127cm. The images with the tape measure illustrates the range of the rapid system brackets. They are fully open but move towards the outer edge when tightened. Bought as seen. There is some wear to the rubber where the carriers made contact. See photos.
eBay