* Dealership: Your local Cadillac dealership will be able to get you genuine GM parts. This will likely be the most expensive option, but guarantees OEM quality. They'll be able to confirm the correct part numbers based on your VIN.
* Auto Parts Stores: National chains like AutoZone, Advance Auto Parts, NAPA, and O'Reilly Auto Parts usually carry a selection of aftermarket parts for the Northstar. You'll need to provide them with your vehicle's year, make, and model (and possibly engine size - 4.6L Northstar) to find the correct parts. Be aware that aftermarket parts can vary in quality.
* Online Retailers: Websites such as Amazon, eBay, RockAuto, and others often sell both OEM and aftermarket parts. This can be a convenient option, but make sure to check seller ratings and reviews before purchasing. Again, accurate year, make, model, and engine details are critical.
* Junkyards: Finding used parts from a junkyard is the cheapest option, but carries the most risk, as the part's condition may be uncertain.
Important Note: The Northstar's water pump pulley is often integrated into the water pump itself. It's *not* usually a separate replaceable part. If the pulley is damaged, you'll likely need to replace the entire water pump. The tensioner, however, is a separate component.
Before you buy: Confirm if you need only the pulley *or* the entire water pump. Double-check part numbers with your chosen supplier to ensure compatibility with your specific 1996 Cadillac Northstar. Using the wrong parts can lead to further damage and costly repairs.
