Do I need to drill or modify my existing light housing to install these?

These are designed as a bolt-on replacement. Check your OEM light mounting points and fastener locations before ordering to confirm alignment with your setup.

Should I apply additional clear coat after installation?

The units ship with UV-protective clear coat applied. A fresh topcoat is recommended if you're prepping the mounting surface or want to match your paint finish, but it's not required for protection.

What's the difference between these and the plastic OEM lights?

Carbon fiber resists the yellowing and brittleness that affects plastic housings over time. The material also runs cooler under LED load, which extends component life in the long run.