Do these plug directly into factory wiring?

Yes. These are designed as direct replacements, so they connect to your existing headlight harness with no modification needed.

Will the U-ring angel eyes work with my factory settings?

The LED angel eyes will power on whenever your low beams are active. If you want them as a standalone accent light, you'll need a separate relay or switch wired in — that's not included.

What if one bulb burns out?

The halogen bulbs are standard replacements — you can grab spares at any auto parts store. The projector housings themselves are sealed units, so the bulbs are the only wear item you'll need to swap.