S550 Mustang Front Lower Control Arms

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The SPL Front Lower Control Arms (FLCA) provide roll center, camber, and track width adjustment for S550 Mustangs. Using a mixture of billet aluminum, stainless steel, chro-moly steel, and titanium results in strong, adjustable arms that are 2.0 lbs lighter than stock Performance Pack arms. Non Performance Pack Mustangs will also benefit from eliminating bushing deflection, resulting in sharpened steering response and driving precision.

The ability to run more negative camber greatly improves the peak lateral grip available, dropping several seconds off of lap times when tested on the Vorshlag Dark Horse. This is especially important with better tires and a must-have for anyone looking to prevent excessive outer shoulder wear (and heating) on their tires due to a lack of camber.

The lower control arms come with a ride height sensor bracket to maintain factory ride height sensor location, regardless of length of the arm to keep the Ford chassis electronics happy.


  • Adjustable Camber, Roll Center, and Track Width

  • Eliminates Bushing Deflection

  • Improved Peak Grip and Tire Life with Ideal Camber Settings

  • Lightweight, High-Strength Construction

  • Stackable 304SS Roll Center Spacers in 1/8" and 1/4" Sizes

  • US Made, PTFE Lined FK Rod Ends 



  • 6061-T6 Aluminum Black Anodized Arm and Clamps

  • 4130 CrMo Electroless Nickel Plated Double Adjuster

  • Ti6Al4V Titanium Socket Head Cap Screws

  • 304 Stainless Steel Roll Center, Mounting, and Knuckle Spacers

  • 5/8" 4340 CrMo Stud

  • FK PTFE-lined Spherical Bearings (F1 spec, self-cleaning)


Suitable for all uses, from daily driver to race car.



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Confirmed Applications

2015 - 2023 Ford Mustang (V6 / EcoBoost)

2015 - 2023 Ford Mustang GT

2024+ Ford Mustang (S650, Inc Dark Horse)


DOES NOT fit the Shelby GT350, GT350R, or GT500.

We have specific FLCAs for those fitments:

Shelby GT350 / GT350R (Exc. 2020 GT350R) Front Lower Control Arms

Shelby GT500 / 2020 Shelby GT350R Front Lower Control Arms

Install Instructions

SPL FLCA S550 Instructions



Ford made numerous variations of the front knuckles across the S550 Mustang and Shelby line-up. These knuckles vary across nameplates (Mach 1, GT350, etc), years (2019 vs 2020 GT350), and even options (Handling Pack 2, etc).

Each knuckle variant may have different conical tapered seats where the front control arms mount. It is VERY IMPORTANT to verify the supplied conical tapered spacer fits snuggly into the knuckle, has near zero lateral end play (as-in it will not rock within the bore), and seats fully into the knuckle when installed at the proper torque value.

If you need clarification or feel you may have the wrong spacer for your Mustang, then please email us.