Track Width: the front knuckles increase your truck's track width by .5" on each side.
Wheel Fitment: the front knuckles require 17" or larger wheels with a maximum of a 5.75" backspace to clear 12.50" wide tires.
2WD F150s Only: this kit will only fit 2WD F150s and will not fit 4WD models. This was designed for F150s that have factory rear blocks. A kit for trucks that do not have stock rear blocks is also available.