The 21278 is a alternator, a new aftermarket direct replacement engineered to match the fit, form, and function of the original alternator. Confirm exact fitment with your year, make, and model before ordering. Why ePartsGlobal: specialist in heavy-duty starters, alternators, and charging-system electrical parts. Backed by a 1-year warranty, free shipping on orders over $19.95, and fast fulfillment. Ships from USA.