Will this glass fit into my existing mirror housing, or do I need a new mirror assembly?

This is a glass lens only—it slides into your factory mirror housing. The assembly stays in place. You're just swapping the transparent part.

Do I need any adhesive or fasteners to install this?

Test-fit the lens into your housing first. Most factory designs hold the glass with clips or a snap-fit frame, but mounting method specifics depend on your mirror model year and style—check your housing before you commit to any adhesive.

This is only the right side—how do I order the left?

Order a separate left-side lens if you need both. This listing is right only. Check your cart to confirm which side you're buying.