I have a Hummer H3. It has built-in ducts on the roof. I used these adapters to install Surco S5060 Safari Rack. These adapters fit perfectly, but some maneuvering is required to install the square nut that fits the channel. Also, the bolts for these nuts get too short once the adapter is installed so I had to dig up some longer bolts from the shed. Once installed, the adapters are pretty solid. Just don't expect the engine block to rest on the roof.
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