Will this fit into my current mirror housing without modification?

Yes. This is designed as a direct replacement using factory mounting points on the existing housing. No drilling, cutting, or bracket work needed.

Do I need any adhesive or fasteners to secure the lens?

Mounting hardware specifics aren't listed — test-fit the lens into your housing first to confirm the attachment method (factory clips, adhesive backing, or fasteners already in place) before committing to installation.

Can I order the left side mirror separately?

This is a right-side-only unit. Left side mirrors are listed separately on ModSupply — confirm the side you need before checkout.