Chevrolet 2005 SSR Pickup Owner's Manual page 107

4. Prepare to insert a tapping plate into the floor
track by locating the end of the plate that has
the shortest distance between the end of the plate
and the first stud. The distance will measure
approximately 3.9 inches (100 mm).
5. Insert a tapping plate into the tailgate end of the
floor track and slide it forward, making sure that
the three studs on the plate are facing upward.
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