These are the two-piece gizmos that work with slotted factory racks. I had them on a Dodge Caravan. One piece stays on the track and the other receives the crossbar and quick connects with a spring-loaded button/lock. Thule is very "proud" of their hardware ($$$) and I hate to see these go unused. You'll need the crossbars.
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Chris,
I am interested if they are still available. Call me 678-878-7607 and let me know.
John
sold