I took a look at Steele Rubber quickly. Yikes. Looks like to would cost more to re-rubber a Pinto than many have paid for them! http://www.steelerubber.com/search?year=1973&make=ford&model=pinto&style=2-door-wagon

Glad I pulled "better than what I have now" rubber out of Pinto's at about $3 a piece when I found them at Pick Your Part. I didn't recall seeing a rear hatch seal for the wagon. I've looked at a lot of seals in the yards and the one I thought came the closest to the Pinto still missed by quite a bit. So, finding something to work there is going to be a chore.

 If money is an object you might find other cars that do have something adaptable.  The 1st Gen. Mazda MPV has door seals that resemble that typically used on a lot of 60's/70's cars. I used them on my '64 Studebaker. Even though over 15 years old the rubber was very good and at $3 a door it was a good fit for my wallet.

Unfortunately that post refers to a hatch and is different than the rear door on a Wagon. After the rubber slides over the pinch weld it needs to go a fair distance to the rear to seal at the bottom.  I found something in a late 90's Cadillac and thought it might work, but it still comes up short. And, after looking at MANY cars that was the closest I could find.

Thanks for clearing that up.  The bottom section seems the most difficult to seal.  I'm tired of the fumes. I'll be looking into it shortly as I'll be going by Pick Your Part tomorrow.