Will these bolt directly onto my truck without drilling new holes?

Yes. These use factory mounting points, so they'll slip into the existing location without any frame modification or new fastener holes needed.

Do I need to source bulbs separately, or are those included?

Bulbs are not included with this set. You'll source those on your own and install them into the housings once they arrive.

Can I paint or modify the chrome housing if I want a different finish?

The chrome housing can be prepped and painted if you want a custom look—sand it first and use standard auto paint processes. Test on a spare assembly if you have concerns about adhesion.