The Thule Xsporter XK3 Adapter for Toyota Tundra and Tacoma allows the Thule 500 Xsporter Pro pickup truck rack systems to attach to pickup trucks equipped with a bed track system. Trucks that feature such a system are the 2005-2015 Toyota Tacoma and 2008-2015 Tundra.
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These do not fit the 2018 Tundra with bed rails, and I suspect other years. I ended up having to remove the bed rails to install the Xsporter on my truck. The XK3 is designed to fit the Tacoma. Thule does not make an adapter that fits the Tundra. Otherwise the adapter are well made as expected from Thule.
These Adapters worked great. They are easy to install and fit securely as they are suppose to. Use of an allen wrench to secure the retaining bolts takes a little time due to the closeness of the bolt heads to the side of the truck body. I used a set of sockets for this purpose. Made the installation a lot easier and faster.