Product details:

This cantilever extension works only with TracRac SR "XT" and Thule TracRac Pro 2 truck rack cross bars. It adds a third bar over the cab of your truck, to support longer cargo and protect the cab roof. TR24002XT is for use on Fullsize trucks. Extends 32 inches over the cab. 100% rust-free aluminum. DOES NOT WORK with TracRac or T-Rac Pro systems manufactured prior to January, 2018. Fits on Thule TracRac SR XT Overhead Racks 43001XT. Fits Thule TracRac Pro 2 Rack 37002XT.