The weatherstrip that the retainer holds in place on the lower door is the same all the way around the door. That pic from Steele shows the windlace that goes to the cab floor and presses against the closed door about 3" above the door bottom. The detail in the circle on the left of that figure isn't exactly correct for AD trucks, because the retainer is on the horizontal portion of the floor, not the vertical. That detail looks like it might be correct for a Taskforce series truck. Here's a pic of the windlace installation on the floor.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.