I purchased the expensive Thule Motion XT L rooftop box after checking the "fit my car" feature. When the box arrived, I discovered that the box does not fit my 2015 Mazda CX 5 with factory crossbars. The seller would accept the return only if I pay their shipping fee, my shipping fee and a return fee.
Thule did not even care. I asked "Do you have crossbars that can be installed on Mazda and that will allow the 5th door to open?" and they responded "Unfortunately, we do not have a solution to fix that hatch clearance issue." Thule has a solution, but they do not care about customers.
Thule does not care about your purchase either, because the fit guide still says the box fits. Do not buy the box, it will not fit even if Thule says it fits.