Do these lights plug directly into the factory harness?

These are designed as direct replacements at factory mounting points. Confirm your vehicle's connector type before ordering — some models may require a simple adapter harness depending on your year.

Will these work with my factory bumper or do I need an aftermarket piece?

These bolt into the factory bumper at OEM locations. No bumper replacement required unless your current housings are damaged or you're running an aftermarket front end that uses different openings.

Are the lenses sealed against moisture?

Crystal clear housings are sealed assemblies. If you're installing into a bumper with cracks or gaps, seal those areas before install to keep water out of the light cavity.