Sorry guys, I was at school! Senior year, spending it on a Gran Turismo 2 forum. and STILL making A's and B's! ;D
But YES, the 1967 Mercury Cougar XR-7 IS correct! as far as I know.
And to answer the next question, I wanna say either the Saleen SR Widebody, or there is a 3000GT LM edition car (forgot where I won it, has a green paint job) that looked pretty dang wide.
As for the widest production car made, haven't the foggiest.