Does this come with the mounting hardware or mirror backing?

Lens only. You'll need your existing mirror backing and hardware to complete the assembly — this is just the glass replacement.

Will this fit my current mirror assembly without modification?

Yes, this mounts at factory rocker points with no drilling or adapter plates needed. Test-fit before final installation to confirm alignment with your backing plate.

Can I prep and paint this before installation?

The lens itself doesn't require primer or paint — it's ready to install as-is. If you're swapping into an existing mirror backing, handle the glass carefully to avoid edge chips during work.