Do I need to replace my existing bulbs, or are they included?

The LED DRL elements are built into these housings. You'll need to confirm your current bulb compatibility with these assemblies before install — some buyers swap in OEM or aftermarket bulbs to match their brightness preference.

Will these work with my factory wiring harness?

These are designed as a direct replacement for your Colorado's original headlight assembly. Test the connector fit before final installation to confirm compatibility with your model year.

Do these require any prep work before installation?

No special prep needed — they're ready to install out of the box. Just pull the old housings, mount these in their place, and reconnect your harness.