can you get a third tail light sticker or the whole lens that says supercharged if so where ?

 

That's a lot of letters for the 3rd tailight. My g/f has AM's "MUSTANG" decal on her '06 Pony and even with only 7 letters I had to put in a brighter bulb. You still have to be somewhat close to read it. 12 letters? I don't think so but you never know.

 

I've seen the "Mustang" and white "Shelby" ones. Haven't seen supercharged. Believe they have emblems though..