To find the correct belt size, you MUST:
1. Consult your owner's manual: While this might seem obvious, it's the best starting point. The manual should list the correct belt size for your specific configuration (or at least provide a chart that helps you determine it).
2. Check the belt itself (if still installed): The size is usually printed on the belt itself.
3. Use a belt measuring tool: Auto parts stores sell inexpensive belt measuring tools that accurately measure the belt's length. This is the most reliable method if the belt is already off the car.
4. Check a reputable online parts catalog: Websites like RockAuto, AutoZone, or Advance Auto Parts allow you to search for parts based on your vehicle's year, make, and model. *Be sure to specify the "no AC, no smog pump"* option if available.
Don't guess. Using an incorrect belt size can lead to belt slippage, premature wear, and even damage to your engine's components. Take the time to find the correct size using one of the methods above.