Will this bolt straight onto my existing mirror housing?

Yes — it mounts at the factory rocker points on your current mirror assembly. Swap the old glass for the new one and you're done.

Do I need to remove the whole mirror from the door to swap the lens?

Most Colorado owners can access and replace the glass without pulling the mirror housing, but your truck's trim level and door configuration may affect ease of access. Test-fit before committing to the swap.

Does this come with any adhesive or sealant?

The lens assembly itself is included. Check your mirror housing for existing gasket material before installation — you may reuse it or apply new weatherstripping depending on condition.