The one piece rubber has a single right angle. That goes in the lower corner at the back of the door.
FWIW, I used both Steele and Soffseal door rubber and couldn't get my doors to shut. I ended up needing two thicknesses of rubber so the doors would align correctly. See:
http://picasaweb.google.com/ChrisAurit/ItSChrisGreenTruck#5349524038267861362 and http://picasaweb.google.com/ChrisAurit/ItSChrisGreenTruck#5349521497789796018 for the end result of the experiment.

[b]1957 Chevy Big Window 3100[.b]

In the Stovebolt Gallery
More pix in Picasa

It ain't broke 'til you can't fix it any more.