Do these need any special wiring, or can I splice them into the existing fog harness?

The harness included is designed to integrate with your vehicle's electrical. Test-fit the connectors before committing to any permanent splicing—some vehicles have different terminal configurations.

Can I use a different bulb, or am I locked into H11?

H11 is the spec for this housing. Other bulb types won't fit the socket properly, so stick with H11 replacements when you need them.

What if the housings don't fit tight or the switch doesn't line up?

Contact support with photos before installation. Small gaps can usually be shimmed; if alignment is genuinely off, we'll make it right.