Unless certainly no space technology, the purchasing tool to the Thule site is quite helpful in choosing the right components.
The quality of the parts is as one would expect from a brand manufacturer.
Shockingly, however, what to expect during the assembly; the accompanying instructions refer to the instructions for the other wild Thule Components, everything 'explained' only by appropriate drawings and pictograms, not a written word!
Who has no experience with the construction of roof rack systems and / or who is missing craftsmanship base skill is despair in the construction ... Thule could through better (and modern!) Instructions quickly make things right!
4 stars for the actual product, including price / performance ratio, a point deduction for the very poor guide!