What size are the rear speakers on a 1998 Chevy C1500 extended cab pickup?

The 1998 Chevy C1500 extended cab's rear speakers are typically 5x7 inches. However, some models might have had slightly different sizes depending on the sound system option chosen from the factory. It's always best to verify this by physically checking the size of the existing speakers or consulting your owner's manual if you still have it.