Will this glass fit my existing mirror housing without modification?

Yes. This lens mounts directly to factory mirror backing plates using the same bolt pattern. You're swapping glass only — no brackets or adapters required.

What if the glass doesn't seat flush when I first test-fit it?

Check that the backing plate and lens edges are clean and free of debris. If fitment feels off, test with hand pressure before fastening — the panel should sit flush. If gaps persist, the backing plate may need inspection.

Are fasteners included to attach the glass to my mirror housing?

The lens assembly is shipped without mounting hardware. You'll use whatever fastening method matches your factory backing plate — typically factory clips or small bolts from the mirror housing itself.