This gusset is a structural reinforcement bracket located at the bottom of the seat box on the left-hand side, used on Defender and Series vehicles to maintain rigidity at the junction between the seat box and the body or floor structure. Over time, corrosion and stress cracking at this area are common, particularly on older chassis, leading to flex and instability in the seat box assembly. Correct replacement restores the intended structural integrity at this mounting point. Key Features Left-hand fitment specifically - not interchangeable with the right-hand equivalent Applicable to seat box lower bracket position on Series 2, 2A, and Series 3, and on-seat-box position on Defender Supplied as a Britpart replacement part (SKU: 345101) to original Land Rover specification Inspect surrounding seat box metalwork and floor sections for corrosion when fitting, as adjacent panels frequently require attention simultaneously Vehicle Fitment Fits Defender 110 Station Wagon (1986–2006), Defender Crew Cab HCPU to chassis 7A000001 (2007 onwards), Series 2 and 2A, and Series 3 - all left-hand seat box applications. Not sure about fitment? Feel free to get in touch at [email protected]