Ford 2003 Mustang Workshop Manual page 3954

18. Position the center elastic strap to the rear of the folding top center rail and install the screw.
19. Position the rear elastic strap and install the screw.
20. Position the rear elastic strap and install the screw.
21. Trim the excess roof outside cover along the rear tacking strips and around the tacking strip
mounting holes.
22. NOTE: Install new plastic roof headlining retaining pins if they were removed.