NissanPartsDeal.com offers the wholesale prices for genuine 2003 Nissan Altima parts. Parts like Front Seat Belt are shipped directly from authorized Nissan dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 6 Cyl 3.5L. Trim: Base, S, SE, SE-R, SL.