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The Scion xB uses MacPherson strut assemblies on the front suspension. Toyota OEM replacement strut-related part numbers in the 48510 and 48520 series are commonly referenced for front suspension components, though the exact part number depends on model year, trim, and whether the vehicle has Electronic Stability Control or other equipment. Aftermarket complete strut assemblies are available as pre-assembled units that include the strut, spring, upper mount, and often a new bellows boot and bump stop. Manufacturers with IATF 16949 certification follow automotive quality management standards, and modern assemblies may use chrome-plated piston rods for corrosion resistance, high-temperature composite components for durability, and twin-tube or monotube gas-charged designs to improve ride quality and handling. When selecting a replacement, it is important to verify the correct OEM or equivalent part number for the specific Scion xB application to ensure proper fit, alignment, and performance.