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Bilstein's B8 5100 series shock uses a 46mm monotube design to separate the shock oil from a pressurized nitrogen gas chamber, which keeps damping consistent under repeated heavy braking and load changes - exactly the kind of duty a tow vehicle sees on a long haul.
Confirm exact year and trim fitment against Bilstein's application guide before ordering, since shock length and valving vary across the Bronco/F-150 platform.