The 6613 is a 12v delco 41mt-type heavy-duty starter, a new aftermarket direct replacement engineered to match the fit, form, and function of the original starter. Specifications: - Series: 41MT - Voltage: 12V - Pinion teeth: 12 Vehicle Compatibility: - Makes: Freightliner, International, Kenworth, Peterbilt, Sterling Truck (1995-2010) - Models include: Kenworth K300; Freightliner Condor; Peterbilt 320; Sterling Truck AT9500; Sterling Truck Condor; Peterbilt 379 - Confirm exact fitment with your year, make, and model before ordering. Cross-Reference / Interchange Numbers: - Replaces / compatible with: 10461171, 10461171, 10461227, 10461386, 10478999, 10478999, 18509N, 323-897, 3593808C92, 41-6662 (plus 8 more on file). 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.