When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It's like kjett said, you use a bolt to hold the spring pack together. A new center pin that is bolted to just the zero rate keeps the axle in check, and is where you get your wheelbase adjustability (1-1.5").
To confuse even more I'll tell you all this, you HAVE to drill a hole 1.5"s offset of the original on the u-bolt plate to make room for the spring center "bolt" that goes through the zero rate and the leaf pack.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.