Fitment Note for 2017+ Models: These spacers are compatible with 12-bolt rear axles. They are not compatible with 14-bolt or 16-bolt rear axles.

The most reliable way to verify your rear axle is to count the bolts on the rear differential cover:

• 12 bolts = Fits
• 14 bolts = Not Compatible
• 16 bolts = Not Compatible

General Model Guide:

• 1999–2016 Super Duty trucks use a Sterling 12-bolt rear axle from the factory.
• 2017+ F-350 SRW models typically come with the Dana 14-bolt rear axle.
• 2017+ F-250 may have the Dana 14-bolt only if equipped with the Heavy-Duty Tow Package. If your truck does not have the HD Tow Package, it will generally have a Sterling 12-bolt axle.
• 2023+ trucks with High-Output or Tremor packages will generally have the Sterling 16-bolt rear axle.

Because tow-package options vary, counting the bolts on the diff cover is the most accurate way to confirm compatibility before ordering.