Do these use the same bulbs as the OEM markers?

Yes — these are direct replacements that accept factory bulbs. Swap the bulb from your old marker into the new housing and you're done.

Will these fit without removing the fender?

Installation method not specified, but side markers typically access from inside the wheel well or bumper area. Test-fit first to confirm your approach before committing.

Do I need any additional hardware to mount these?

These mount at factory rocker points — check whether your OEM fasteners are reusable or if you need new hardware. Most installs use the existing brackets and clips.