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Finally found the replacement O-Ring at NAPA that the Ford dealership wanted $ 12.50 for, however it did include a 4x4 sticker (yippee)
The Ford part # F3TZ-1K106-A is replaced by a 3.50" I.D. x 3/32" thickness, Napa part # 727-2153. Hope this info helps somebody if needed.
This is the o-ring between the backside of the hub and the rotor.

The Ford part # F3TZ-1K106-A is replaced by a 3.50" I.D. x 3/32" thickness, Napa part # 727-2153. Hope this info helps somebody if needed.

This is the o-ring between the backside of the hub and the rotor.