Next up on the agenda was the sail panels. These panels are unique to the 69-73 Mustang and are applied differently from the plastic ones on the early cars. Note the U-shaped hole in the panel. This is for the wire that runs the heated backlight. We transferred this over to the new panel and used a utility knife to create the hole. We say hole because the original panel hadat one timea square hole rather than a U-shaped slot.