It looks like someone grafted a Mustang fastback roof structure to it. I'm not keen on the extended rear fender tops either; But it looks like someone's Seventies pet project, so it is what it is.
A lot of ingenuity went into coming up with that design. To say nothing of actually putting it together.
Interesting ride. From a project purchase point of view I would be very concerned about the rust and bondo content. Seems it has been sitting the for a good while and not sure about that rear window fit. But a fastback Cougar might be fun.
ahhh found what I was remembering...it was basically just a mustang with cougar lights...I think I like the look of the above design much better. https://www.cjponyparts.com/resourc...Mustang, which,car dealer in Toronto, Ontario.
From the belt line down this looks to be all Cougar with a Fastback roof and deck lid grafted on. The deck lid looks to be extended to make up the difference in Cougar's longer body and to match it's rear edge with the taillights. The bump on the quarters are original to Cougars. Be nice to know it's history.