Ford 1999 Wagon-Econoline Owner's Manual page 74

Seating and safety restraints
Stow the tongue end of the
detachable anchor.
2. Lift and rotate the LH/RH seat latch handles rearward.
3. Lift the LH/RH latch rod hook ends out of the locking holes in the
front strikers.
4. Move the seat rearward and lift the seats rear hooks away from the
rear strikers prior to lifting the front hooks out from the front strikers.
5. Remove the seat assembly.
To install the seat:
1. Position the seat in the vehicle.
2. Align front hooks to front strikers, prior to lowering the rear hooks
and aligning them with the rear strikers.
3. Engage the LH/RH latch rod hook ends in the front striker locking
holes.
4. Rotate the LH/RH latch handles forward, and at the same time slide
the seat assembly forward to engage the strikers. Continue forward
movement until the seat reaches the end of its travel.
5. Make sure the safety belt is not twisted, then insert the seat belt
tongue into detachable anchor until you hear a "click" and feel the latch
engage.
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