Cadillac 1993 Fleetwood Owners Literature page 35

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3. Pick up the latch
plate and pull the
belt across you.
Don't let it get
twisted.
4. Push the latch plate into the buckle until it clicks.
If the belt isn't long enough, see "Safety Belt Extender" at the end of
this section.
Make sure the release button on the buckle faces upward or outward
so you would be able to unbuckle it quickly if you ever had to.