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.