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You will need to buy 4 each of YL3Z-84286A54-AA in order to lock the extender. These are the 4 lockpin bushings that snap into the bed of the truck. (Once they are in, you can't pull them out).
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.