Do these mount at the factory fog light holes, or will I need to modify my bumper?

They mount directly at factory points—no modification required. If your GT already has fog light openings, these bolt straight in.

The bulb is already in the box—do I need to do anything before installation?

The H10 bulb comes installed and ready. Just mount the lights and you're done. Handle the bulb by its base to avoid oils on the glass.

What if one of the lenses arrives cracked or a bulb burns out shortly after?

Contact support with photos and your order number. Returns and replacements are handled case-by-case based on condition and timing.