Chrysler SRT Viper Owner's Manual page 34

32 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
2. The seat belt latch plate is located at the side of your
seat back. Grasp the latch plate and pull out the belt.
Latch Plate
3. Slide the latch plate up the webbing as far as necessary
to make the belt go around your lap.
4. When the belt is long enough to fit, insert the latch
plate into the buckle until you hear a "click."
Latch Plate To Buckle