Dodge 2006 HB Durango - Manual (Page 44)

To reattach the seat belt to the third row center seat, pull
the small (keyed buckle) latch plate forward from the
headliner slots and insert it into the keyed buckle until
there is an audible click. Refer to the previous section for
the proper seat belt usage.
Third Row Center Seat Belt
Third Row Center Seat Belt
44 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE