RAM 1500 Owner's Manual page 58

56 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
2. To reattach the seat belt to the front center seat, pull
the black buckle latch plate forward from the cab back
panel and insert it into the black keyed buckle until
there is an audible "click". For proper seat belt usage,
refer "Lap/Shoulder Belt Operating Instructions".
Inserting Latch Plate
In Use Position