Do these come with wiring harnesses or do I need to splice into factory connectors?

Wiring details aren't specified — your marker light sockets likely match OEM, but verify connector type before ordering if you're unsure about compatibility.

Will these mount flush to the bumper the same way the originals did?

Yes. These are designed to mount at factory marker light locations without modification.

Are these street-legal for my region?

These are OEM-style marker lights for non-AMG models. Check your local regulations — most regions require amber or white marker lights to be DOT/ECE compliant; certification details aren't listed here, so confirm before installation.