(sometimes listed as part of a kit sequence like 145107/145108) is a specialized hardware set used to mount Thule roof racks to specific "naked" vehicle roofs.
If you were searching for "post" in the context of home improvement, there are many designed to cover structural 4x4 or 6x6 beams. 145108 zip
: It provides the custom-shaped rubber pads and metal clips that safely grip your car's door frame without drilling. (sometimes listed as part of a kit sequence