What are the stock speaker sizes in a 2000 Chevrolet silverado extended cab truck?

The 2000 Chevrolet Silverado extended cab's stock speaker sizes depend on the trim level and sound system option. There's no single definitive answer. You'll need to either:

* Consult your owner's manual: This is the most reliable source. The manual will specify the factory speaker sizes.

* Check the speakers themselves: If you can access the speakers (usually by removing the door panels and/or the rear side panels), the size is often printed on the speaker itself.

* Use an online resource: Websites like Crutchfield (crutchfield.com) allow you to select your vehicle's year, make, and model to see the factory speaker sizes and replacement options. This is a good option if you don't have the owner's manual.

Without knowing your specific Silverado's trim level and options, a precise answer is impossible.