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9. Test the fit of the vintage track to the Mustang seat frame and file any additional amount to allow the seat tracks to line up with the tapped holes in the frame. For additional security, we used flat washers, filed on one end to clear the slider stops, to cover the slotted opening in the seat tracks. We know some people simply drill a hole in the seat frame and use a bolt and a nut, but we feel using the factory threaded holes is a stronger solution.