Got mine out today and took a look at the seal. Appears to be a typical D-profile peel & stick weatherstripping. I bought some at Menards a while back for an unrelated project but don't have enough to do the job. The worst part of the job is going to be removing the old stuff.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.