Yoda is installing the much better BullRings ( https://www.bullringusa.com/ ) but I thought I'd show how to install cheap Harbor Freight versions in a Ford truck bed's anchor points. (These were installed because a certain someone didn't leave himself enough time to order and install the Bullrings.)

The six anchor points (three on each side) in the Ford bed are covered with a plastic insert that easily pops out. Unfortunately the HF anchor points didn't fill the space so IMO they looked awful when installed. What I did was carve out the needed rectangle in the plastic insert with a dremel tool and then reassembled the anchor point with the insert, then installed them. The result looks OK and works (for now). Eventually I'll get the Bullrings.