Will this plug into my existing wiring?

These mirrors use factory electrical connectors that align with OEM harnesses. Your vehicle's existing wiring should mate directly without adapters or splicing.

Do I need any fasteners besides what's at the mounting points?

Mounting uses factory points — fasteners already in your door should pull the mirror tight. Verify bolt condition before install since reusing old hardware is standard.

Can I return this if it doesn't fit?

Test fit the mirror before fully tightening. OEM mirrors are application-specific, so double-check your vehicle's generation matches the listing before committing to fasteners.