1971 Mach 1, Grabber Blue w/Argent stripes. Original 2V 351C Auto, Tilt, rear defog, Black Comfortweave Interior. Under restoration. Original colors, 4V 351C, 4-Speed, Spoilers, Magnums, Ram Air. All Ford parts.
I would leave off. I am taking one off a vert now, had to get a new deck lid he had butchered the original. When you put on coupe or vert you have to locate a L.H. trunk spring from a cougar or the trunk will not stay open with the one spring that mustang has. I sold the last two I had last month. The spoiler was not configured to fit the coupe or vert so does not look right. Your car looks great now.
Dynacorn does but I bought a car that had the parts with it. The new rear valance wit twin cut outs like a Q code had for 71 72 but not 73. It did not have the tag mount bracket. I had spot welds but no bracket the stoned worker forgot to load.