Will this bolt directly to my truck without drilling or modifications?

Yes. This mirror uses factory mounting points on 1999–2006 Silverado and Sierra models—no drilling or bracket work required. Line up the holes, bolt it down, and you're done.

Do I need to buy the right mirror too, or can I replace just the left?

You can replace just the left mirror if only that side is damaged. If you need both sides, order the right mirror separately—they are sold individually.

What tools do I need to install this?

Basic hand tools—a socket set and wrench should handle the factory bolts. No special equipment or wiring work needed since this is a manual mirror.