Seat Integrated Restraints (SIR)
WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
SuperCab vehicles may be equipped with a safety belt retractor that is integral to the front outboard seat backrest. To identify a SIR equipped seat, look for the integral safety belt guide tower cap located to the outboard side of the headrest (see arrow in Fig 1).