Dodge 2007 Ram 2500 - Manual (Page 38)

The black buckle latch plate can be removed when the
key is pressed into the buckle. Allow the retractor to take
up the surplus webbing, and the buckles will hang
vertically from the cab back exit bezel, thus freeing up all
the area behind the front seats. 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. Refer to the previous section for the
proper seat belt usage.
Detaching Buckle with Key
38 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE