Steeda Billet Aluminum Vertical Links with | Mustang
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FFP · AUTHORIZED DEALER The leader in Ford performance · Over 35 years · MAP pricing SHOP ALL STEEDA →
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Part #555-4121

2015-2026 Ford Mustang – Steeda Billet Aluminum Vertical Links with Delrin Bushings

Fits These Vehicles 2015-2026 Ford Mustang GT350/Bullitt/GT/EcoBoost/V6
Price Original price was: $369.99.Current price is: $269.96.
  • Engineered and manufactured in Valdosta, Georgia
  • CNC-machined billet construction where applicable
  • Tested on Steeda's SCCA Majors race program
  • Steeda authorized dealer — exact MAP pricing

Limited Lifetime Warranty

Backed by Steeda — FFP is an authorized Steeda dealer and warranty claims are honored direct.

— Function Factory Performance

Authorized Steeda Autosports dealer. MAP pricing — the same price as steeda.com. Expert install available at our Thousand Oaks, CA shop. Questions on fitment or setup? Chat with Senna or call our specialists.

Overview

The full breakdown.

Install
Easy
Time
1 Hour
Origin
Made in USA
Warranty
Limited Lifetime

Overview

These Steeda S550/S650 Mustang Billet Aluminum Vertical Links for 2015+ Mustang GT, EcoBoost, and V6 are made from 6061, aircraft grade aluminum. They feature CNC machined Delrin bushings, and billet steel bushing sleeves and spacers, providing less deflection than the rubber bushings in the stock vertical links, yet does not add any NVH.

These Steeda Mustang Billet Aluminum Vertical Links for 2015+ Mustang GT, EcoBoost, and V6 will not flex under load like the stock links, and will give a better feel of the rear suspension, which helps the rest of the suspension assembly perform as it should.

Our one-piece billet design is accurate down to one-thousandth of an inch (0.001″). The S550/S650 Mustang geometry requires a precise length Vertical Link (something not possible with a welded design), as either a longer or shorter piece will drastically degrade handling and stability.

On the Car

Key Benefits

Delrin (555 4121) : Recommended for Drag Racing & to eliminate wheel hop
Polyurethane (555 4129) : Recommended for handling applications (Street, Road Racing, AutoX)
Reduces wheel hop
Installs easily, with basic hand tools
Will not flex under load
No increase in NVH
Made in the United States with high grade materials

Specifications

Installation Difficulty
Easy
Estimated Install Time
(approx.) 1 Hour
Tools Required
Basic Shop Tools
Origin
Made in the USA

Video

Fitment

2015-2026 Ford Mustang GT350/Bullitt/GT/EcoBoost/V6.

Note: Fits Non-Brembo Package (single piston rear caliper) 2024+ Mustang’s. If you have a Performance Pack or Brembo Package 2024+ Mustang, please see part 555-4130.

Why Steeda
The leader in Ford performance.

Steeda has been engineering and manufacturing Ford performance parts in-house in Valdosta, Georgia for over 35 years — proven on their own SCCA Majors race team and trusted by enthusiasts who live and breathe Ford. CNC-machined billet construction, proprietary CAD-driven suspension geometry, and a relentless focus on the platforms they specialize in.

QS-9000 & ISO 9001 manufacturing · Limited lifetime warranty on Steeda-manufactured parts · Made in the USA

First-hand note

FFP fits Steeda parts every week in Thousand Oaks.

— Why we stock Steeda

OE-style engineering, in-house manufacturing, race-proven on Steeda's own SCCA program.

Steeda has been engineering Mustang — and now Explorer, Focus, F-150, and Maverick — parts in Valdosta, Georgia since 1988. CNC-machined billet, proprietary CAD-driven suspension geometry, and a factory SCCA Majors road-racing team that runs their own parts on the track every weekend. When you bolt a Steeda part onto your car, it's the same part Steeda's own race cars run.

We carry Steeda because the fitment is right the first time, the warranty is real (lifetime on Steeda-manufactured parts), and the install instructions don't leave you guessing. Drop the car at our Thousand Oaks shop and our techs handle the fit-up — or order with confidence and run it yourself.

Authority: Charles Siritho · McLaren Artura Trophy owner · Spotter for Branden Sorensen FD Pro (E46 LS+Whipple, 6th at Long Beach R1 2026) · 10+ yrs Mustang & Corvette specialist

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— FFP is an Authorized Steeda Dealer

Shop the full Steeda catalog at FFP.

The leader in Ford performance — suspension, intakes, exhaust, brakes, wheels, and more — for Mustang, Bronco, Bronco Sport, Explorer, F-150, and Maverick. Enthusiast-driven, race-tested. MAP pricing always. Expert installation in Thousand Oaks, CA.

BROWSE ALL STEEDA →
Price Original price was: $369.99.Current price is: $269.96.
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OVER 35 YEARS IN FORD PERFORMANCE. RACING EVEN LONGER.
— Steeda Autosports · sold & installed by FFP
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