A while back, there was a thread about Imperial front and rear styling themes and other cars. After seeing the '73 Imperial picture (front), I see similar themes in the rear of that '68 and the front of the '73. Interesting.
Probably my thread or post. The hood on the '73 is VERY similar to the deck lid on the '67-'68's. My wife Sammie was the first to point it out to me. Of course I objected... only to realize she was right. God bless her, more of a car girl than sometimes I would imagine!
There are pics of the two somewhere here