Question about Thule Evo Flush Rail 7106

The description does not state that the Thule kit 6007 is required in addition! When I order a foot set for roof racks, I assume that I will get it without additional mounting kits or that these will be explicitly mentioned. I had to order a second one due to urgency and now the hassle of returning the first foot kit. Plus 7 Stutz shipping costs, even though it wasn't my fault!