LexusPartsNow.com offers the wholesale prices for genuine 2015 Lexus GS350 parts. Parts like Rear Steering Gear (4WS) are shipped directly from authorized Lexus dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0L, 6 Cyl 2.5L, 6 Cyl 3.5L.