I just asked Ray Harwood at [email protected] and he sent me an original ad of 71 (maybe 72 and 73 are also the same) and it showed the Cougar script on the passenger side and along side it was the XR-7 emblem. The "a" in the Cougar was half way inbetween the right taillight. Maybe, this is the final answer!
ok...I just went outside to check and Ray was definitely correct. The XR-7 is 1.5 inches above the bottom of the trunk and the Cougar is just a little bit higher. This trunk that I referenced was a 73' so yours should be the same.