{"product_id":"spl-bmw-toyota-front-caster-rod-bushings-non-adjustable-a90-supra-gr-g29-z4","title":"SPL Parts Monoball Front Lower Control Arm Inserts (Compression\/Thrust\/Radius\/Caster\/Tension Rod Bushings) - Toyota GR Supra A90 (MK5) \u0026 BMW Z4 G29 - Spherical Pillowball Bearings, Fixed Geometry Non-Adjustable - CRBN Pair","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eSPL Performance Monoball Compression Arm Inserts for Toyota GR Supra A90 and BMW Z4 G29\u003c\/h2\u003e\n\n  \u003cp\u003eTransform steering feel and front-end precision with SPL’s fixed-geometry monoball inserts for the forward position of the front lower control arm. By replacing the soft OE rubber with motorsport-grade bearings, this kit removes squish and flex in the front radius arm area for razor-sharp response, repeatable alignment under load and confidence-inspiring stability on fast road and track days.\u003c\/p\u003e\n\n  \u003cp\u003eWe have installed these in-house and the difference is immediate: crisper turn-in, more consistent braking stability and clearer feedback through the wheel. Our customers love the upgrade for its quality and the way it tightens up the front end without the vagueness of factory bushes.\u003c\/p\u003e\n\n  \u003ch3\u003eWhy this upgrade\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eReplaces the forward bush in the front lower arm with a true monoball for minimal deflection\u003c\/li\u003e\n    \u003cli\u003eKeeps geometry stable under braking and cornering for predictable handling\u003c\/li\u003e\n    \u003cli\u003eSharper on-centre feel and improved high-speed confidence\u003c\/li\u003e\n    \u003cli\u003eFixed design for OEM-like setup with race-car precision\u003c\/li\u003e\n    \u003cli\u003eIdeal for fast-road builds, track-day use and performance-focused daily drivers\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eEngineering details\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMassive 1 inch FK Racing Bearings with PTFE liners for low friction and long service life\u003c\/li\u003e\n    \u003cli\u003eCNC-machined 6061-T6 aluminium bearing carriers with knurled outer for a secure press fit\u003c\/li\u003e\n    \u003cli\u003eFKS Series specification for smooth articulation and durability\u003c\/li\u003e\n    \u003cli\u003eMade in the USA\u003c\/li\u003e\n    \u003cli\u003eSold as a matched pair\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eToyota GR Supra A90 - 2020 onward\u003c\/li\u003e\n    \u003cli\u003eBMW Z4 G29 - 2019 onward\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWho will benefit\u003c\/h3\u003e\n  \u003cp\u003eIf you are chasing more direct steering, reduced braking dive-induced geometry change and a planted front end on your Supra A90 or Z4 G29, this is the go-to front arm upgrade. Perfect alongside coilovers, uprated anti-roll bars and performance alignment settings.\u003c\/p\u003e\n\n  \u003ch3\u003eInstallation and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional fitting is recommended. MJ Modifications in Warwickshire can supply and install these inserts and carry out alignment. Request a fitting quote at \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003eSPL CRBN G29\u003c\/p\u003e\n\n  \u003ch3\u003eAlso searched as\u003c\/h3\u003e\n  \u003cp\u003eSupra A90 front lower arm forward bush upgrade, Toyota Supra A90 monoball kit, Supra A90 compression arm bearings, BMW Z4 G29 thrust arm bearings, Z4 G29 front radius arm bush pair, pillow ball control arm insert, fixed-geometry front arm bearings, FK bearing bush kit, aluminium bearing housings Supra, performance front control arm upgrade Z4, SPL CRBN G29 UK stock, track day suspension upgrade Supra, steering response upgrade BMW Z4.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SPL","offers":[{"title":"Default Title","offer_id":56008711799170,"sku":null,"price":454.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/CRB_E9X_2_800_sm__62576.jpg?v=1764091212","url":"https:\/\/mjmodifications.co.uk\/products\/spl-bmw-toyota-front-caster-rod-bushings-non-adjustable-a90-supra-gr-g29-z4","provider":"MJ Modifications","version":"1.0","type":"link"}