Will this fit into my existing mirror housing?

Yes—this is designed to drop into your factory mirror frame. The mounting tabs align with your current setup; no drilling or adapter brackets needed.

Do I need to remove the whole mirror assembly to swap the glass?

No. The lens itself is replaceable. You can unbolt the old glass and bolt the new one in place while the mirror housing stays mounted to the door.

What if I need both left and right mirror lenses?

This listing is left-side only. Order the right-side lens separately if you need to replace both.