Chrysler 1500 Owner's Manual page 49

THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 47
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
2
"Lap/Shoulder Belt Operating Instructions".
Detaching Buckle With Seat Belt Tongue