Ford Mercury Villager 1997 Owner's Manual page 166

Tethering to floor anchor
Ford recommends placing tethered safety seats in a rear seating
position with the tether strap attached to the tether anchor bolt as
shown in the following illustration.
Tether anchor point locations
To gain access to the anchoring bolt, cut through the plastic
along the U-shaped tether location outlines on the carpet of the
luggage area. Remove the bolt that is currently in the anchor
location. The tether anchor hardware has been preassembled.
To attach it, orient the tab in the bracket toward the front of the
vehicle and securely tighten the bolt. Follow the child safety
seat directions for attaching the tether strap to the anchor bracket.
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