Do these bolt directly to the towing mirror, or do I need to modify the mirror?

They mount directly to factory towing mirror bolt holes—no drilling, cutting, or bracket modification needed. Install time is about 15 minutes per side with basic hand tools.

Will the amber light still be visible through the smoked lens at night?

Yes. Smoked lenses reduce light output slightly but maintain full DOT compliance and visibility. The amber bulb shows clearly, especially when lit against darker backgrounds.

Are these hardwired, or do I tap into the side marker circuit?

They connect to your factory side marker wiring—no new circuit needed. If your truck has turn signal mirrors, these tie into that existing harness.