Does this come with the bulb?

Bulb is not included — you'll need to transfer your existing bulb or source a replacement separately. Check your owner's manual for the correct bulb type.

Will I need new fasteners or brackets to install this?

Installation uses factory mounting points with no drilling. Bring a socket set and basic hand tools; existing fasteners typically work, but inspect them first for corrosion before reinstalling.

How do I know if the seal is holding before I hit the road?

After install, run the truck through a car wash and check the interior of the housing for water pooling. If it's dry, the seal is good. If moisture appears, contact support for a replacement.