Porsche 911 Carrera Owner's Manual page 194

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.
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Mobile Roofs
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 pan-
els.
Check whether the square pins are correctly
engaged.
8. Lift upper section of windstop if required.