Will these fit flush with the factory bumper cutouts?

Yes. These mount to the existing side marker locations on your rear bumper. Alignment depends on clean fitment—test the lights in place before fully securing to make sure they sit flush.

Do I need to pull the bumper to swap these in?

No. Factory side markers are accessible from behind the bumper panel. You can usually remove them without removing the bumper itself, but your vehicle's service manual will confirm access points.

Are these plug-and-play, or do I need to splice wires?

Wiring configuration is not specified in the product data. Confirm whether your bumper's factory connector matches these lights before ordering, or plan to test-fit the harness to your existing wiring once they arrive.