Do these lights come with H3 bulbs installed?

The assembly includes the H3 socket configuration. Verify bulb inclusion before install—you may need to source bulbs separately depending on your order.

How do I mount these to my roof if I don't have a roof rack?

These are designed for universal roof mounting. If you're using factory roof attachment points, test-fit before drilling or bonding. Mounting method and hardware spec varies by vehicle—verify your roof's load capacity and attachment points beforehand.

Can I wire this switch into my existing fog light circuit, or does it need to be standalone?

The integrated switch makes these operate independently. You can run them standalone using the included harness, or splice into your existing circuit if you prefer unified control—either way, keep power draw in mind for your vehicle's electrical system.