Ford Mustang Owner's Manual page 111

Convertible models
Entering the rear seat (convertible)
To enter the rear seat:
1. Remove the shoulder belt from the seat belt
guide on top of front seat.
2. Remove the lap belt from the seat belt guide
on side of seat.
3. Enter the rear seat in front of the safety belt.
4. Place the lap and shoulder belt into the
guides to allow use by the front seat
passengers.
Folding Rear Seat (Coupe only)
To fold down the rear seats, gently pull on the
release straps.
NOTE: It may be necessary to apply slight
hand pressure to top of seatback while
pulling on release strap.
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