Will this work with my existing mirror housing, or do I need the whole mirror assembly?

This is the glass lens only — your current mirror housing and backing plate stay in place. You're replacing just the transparent glass element that's cracked or clouded.

Do I need to remove the mirror from the door to install this?

Mounting method not specified in the product data — test-fit your mirror assembly before committing to removal. Most Crown Vic mirrors mount at the door skin, so you may be able to swap the lens without full disassembly; verify with your vehicle's service manual.

What if the glass doesn't fit or has defects when it arrives?

Contact ModSupply directly with photos of the issue and your order number — they'll handle returns or replacements according to their policy.