LexusPartsNow.com offers the wholesale prices for genuine 2015 Lexus IS250 Base parts. Parts like V-Belt 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. Trim: LUX.