Porsche 911 Carrera - Manual (Page 218)

6. Insert fastening tabs C of the windstop into the
guides of the safety belts. Make sure that the
plastic peg E engages in the center guide of
the windstop.
7. Push red locking handles inward and swivel
downward. Spring force pushes the square
pins of the locks into the receivers D in the side
trim panels. Check whether the square pins
are correctly engaged.
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Mobile Roofs