Do I need the left side too, or can I buy just the right?

You can buy right only. This is sold individually, so order both sides only if both need replacement. Single-side replacements work fine for accident damage or spot wear.

What tools or hardware do I need to install this?

Mounting hardware is not included with the lens. Check your vehicle's service manual for fastener specs and torque values — most mirror glass swaps use clips or adhesive backing depending on your exact model year.

Is this glass heated or does it have any special coating?

Lens type and features are not specified. If your vehicle originally had heated or tinted mirror glass, verify the exact option code before ordering to ensure compatibility with your existing mirror frame and electrical connections.