Will this plug straight into my vehicle's wiring?

Yes. This is the factory connector and harness setup — it wires directly to your 300C's existing mirror controls without adapters or modification.

Do I need to adjust or align the mirror after installation?

The mirror glass itself is adjustable via the vehicle's power controls once installed. The assembly mounts at factory points, so no modification is needed — just secure and connect.

Can I return this if it doesn't work with my car?

Fitment is your responsibility before purchase. Verify your vehicle year and side (right mirror) match the listing. Once installed and tested, return eligibility follows standard policy — reach out to confirm your specific situation.