SuperPro SPF4358K Front Lower Inner Forward Control Arm Bushing for Lexus IS GS

Vehicle Fitment

• 2006-2013 Lexus IS250 (GSE20 Platform, RWD, 2.5L V6)
• 2010-2013 Lexus IS250 C Convertible (GSE20 Platform, RWD, 2.5L V6)
• 2006-2013 Lexus IS350 (GSE21 Platform, RWD, 3.5L V6)
• 2008-2014 Lexus IS F (USE20 Platform, RWD, 5.0L V8)
• 2006 Lexus GS300 (GRS190 Platform, RWD, 3.0L V6)
• 2007-2011 Lexus GS350 (GRS191/196 Platform, RWD, 3.5L V6)
• 2006-2007 Lexus GS430 (UZS190 Platform, RWD, 4.3L V8)
• 2007-2013 Lexus GS450h (GWS191 Platform, RWD, 3.5L V6 Hybrid)
• 2008-2011 Lexus GS460 (URS190 Platform, RWD, 4.6L V8)

Fitment Notes

• Fits the front (forward) position of the front lower inner control arm only
• RWD variants only; AWD IS250/IS350 models use a different front suspension geometry
• For the rear position of the same control arm, see SPF3491K (standard) or SPF3692K (camber correction)
• Front wheel alignment required after installation

Features

• Direct OEM-equivalent replacement at the front lower control arm forward mount - restores correct caster geometry under load
• Made from SuperPro's engineering-grade polyurethane for significantly greater durability than factory rubber
• Eliminates the deflection and compliance in the forward control arm pivot that contributes to steering imprecision under braking and cornering
• Retains OEM-level NVH isolation while delivering improved suspension precision for street and track use
• Resistant to oils, coolants, heat, and road chemicals - will not degrade like rubber over time
• Backed by SuperPro's Lifetime Warranty covering street, track, and motorsport applications
• Designed and manufactured in Australia with 40+ years of suspension expertise

Specifications

• Position: Front Lower Control Arm - Inner Front (Forward) Bushing
• Type: Standard Replacement (OEM alignment geometry)
• Material: Engineering-grade polyurethane with steel tubes
• Drivetrain: RWD only, as listed
• UPC: 9317745043584
• Warranty: Lifetime

Included Components

• 4x Polyurethane Bushings
• 2x Steel Tubes

Product Description

The SuperPro SPF4358K is a front lower control arm inner forward bushing kit designed for Lexus IS and GS platforms sharing the RWD IS220/250/350/F and GS190 architecture. The front lower control arm on these models uses two bushing positions - this kit addresses the front (forward) mount, which is the pivot point that most directly influences caster geometry as the suspension moves through its travel. When the OEM rubber at this position wears, the control arm gains compliance in the longitudinal direction under braking and acceleration, contributing to vague steering response and inconsistent straight-line tracking.

SuperPro's polyurethane replacement firmly locates the control arm at the forward pivot while retaining acceptable street-level NVH. The kit is a direct press-in replacement requiring no modifications to the control arm housing. A front wheel alignment is required after installation. Backed by SuperPro's Lifetime Warranty with no exclusions for track or motorsport use. For the rear position of the same control arm, refer to SPF3491K or the offset camber-correction variant SPF3692K.