Will I need to replace the bulbs, or do they come installed?

These use your original bulb configuration — pull out the old bulbs and drop them into the new housings. No bulbs are included, but you'll reuse what you have.

Do these bolt straight up, or is there any custom wiring involved?

They bolt straight in at factory points. Wiring is plug-and-play with your existing harness — no splicing or modifications required.

Can I see these before committing to installation?

These are ready to test-fit right out of the box. Mount them temporarily before fastening permanently; make sure the lens sits flush and lights function as expected.