Will this bolt up without modification?

Yes — this uses factory mounting points. No drilling or bracket fabrication needed. Test-fit before final installation to confirm alignment with your specific vehicle condition.

Do I need to source bulbs separately?

The assembly does not include bulbs. You'll need a 9006 for low-beam and 9005 for high-beam. Both are common wattage bulbs available at any auto parts retailer.

Can I paint or modify the housing?

The hard panel construction can be sanded and painted if needed. Prep with fine-grit sandpaper, prime with automotive primer, and finish with urethane-based paint. Seal all seams before reinstalling to prevent moisture intrusion.