SPL Front Lower Control Arms BMW Z4 G29 (2019-2025) Toyota GR Supra A90 (2020-2025) Roll Center Correction FLCA G29

Fitment Information

• BMW Z4 sDrive30i G29 (2019, 2020, 2021, 2022, 2023, 2024, 2025)
• BMW Z4 sDrive M40i G29 (2020, 2021, 2022, 2023, 2024, 2025)
• BMW Z4 M40i First Edition G29 (2020)
• Toyota GR Supra Base A90 (2020, 2021, 2022, 2023, 2024, 2025)
• Toyota GR Supra Premium A90 (2020, 2021, 2022, 2023, 2024, 2025)
• Toyota GR Supra A91 Edition (2021, 2022)
• Toyota GR Supra Launch Edition A90 (2020)
• Note: If running aftermarket sway bars or aftermarket caster adjustment, verify clearance between the SPL FLCA and the sway bar before driving. Contact between the two can damage the arm. SPL's Caster Adjustable Tension Rod Bushing (CRB G29) and Adjustable Front Endlinks (FE G29) can resolve clearance issues if they come up

Fitment Note: These front lower control arms fit the BMW G29 Z4 and Toyota GR Supra A90, which share the same front suspension architecture. Aftermarket sway bars or caster adjustment hardware can sit really close to this arm, particularly on early 2019 Z4 and 2020 Supra builds. Check clearance before you drive it if you have either of those mods. SPL makes a Caster Adjustable Tension Rod Bushing (CRB G29) and Adjustable Front Endlinks (FE G29) if you run into clearance issues. Sold as a pair. Professional installation and a full alignment are required after installation.

Specs and Features

• SPL Part Number: SPL FLCA G29
• Sold as a pair
• Provides roll center correction, camber adjustment, and track width adjustment
• SPL Double Adjuster design: no jam nuts, rotating clamp locks down camber and track width settings without needing multiple wrenches or fumbling to hold bearings in place
• Double Adjuster machined from 4130 Chromoly, gun drilled to reduce weight, electroless nickel plated for corrosion resistance
• FK Rod Ends and High Misalignment Spherical Bearings eliminate the flex and binding found in OEM rubber bushing arms
• Blue Anodized Titanium hardware reduces unsprung weight without compromising strength
• Stainless Steel spacers included to correct roll center on lowered vehicles
• Main arm slotted to allow use of pinch bolts for secure clamping
• Fully rebuildable, replacement rod ends available separately from SPL
• Made in the USA
• 10-year / 100,000-mile warranty against defects in materials and workmanship

The Double Adjuster is what separates this from most adjustable arms. Instead of jam nuts that you have to hold in position while tightening with two wrenches, SPL uses a rotating clamp that locks everything down in one motion. If you've fought with jam nuts on other arms before, you know exactly why this matters. One thing to sort out before you drive the car: if you're running aftermarket sway bars or any kind of caster adjustment hardware, check clearance between the arm and the bar before you take the car off the lift. The sway bar sits close to the lower arm on these platforms from the factory, and moving the arm changes that geometry. SPL makes a caster adjustable tension rod bushing and adjustable front endlinks specifically to create clearance when it's needed.

Pairs well with:

• SPL Parts Eccentric Lockout Kit for Toyota GR Supra A90 / BMW Z4 G29 The stock eccentric bolts on this platform are known to slip under hard cornering, shifting your alignment after you've had it set. SPL's lockout kit eliminates them and replaces them with zero-slip CNC machined hardware. Run this alongside the FLCAs so the alignment you dial in at the shop actually stays there.

OEM Part Numbers Cross Reference

• 31126884805 (Front Lower Control Arm, Driver Side, 2019-2025 BMW Z4 G29 / 2020-2025 Toyota GR Supra A90)
• 31126884806 (Front Lower Control Arm, Passenger Side, 2019-2025 BMW Z4 G29 / 2020-2025 Toyota GR Supra A90)

The OEM part numbers above apply to the front lower control arm position shared between the BMW Z4 G29 and Toyota GR Supra A90 platforms. Confirm your specific factory part numbers using your VIN at a BMW or Toyota dealer if needed. This SPL kit replaces both front lower control arms as a matched pair and adds roll center correction, camber adjustability, and track width adjustment that the factory arms do not have.