Do these mount to the factory locations without modification?

Yes. These bolt directly to your Dodge Ram's factory headlight mounting points. No drilling, welding, or bracket fabrication needed.

What bulbs do I need to install?

Bulb type and specifications depend on your specific year and model configuration. Check your owner's manual or contact a parts specialist to confirm the exact bulb size for your truck.

Are these housings ready to bolt on, or do they need prep work?

The chrome housings ship ready to install. If you're reusing existing bulbs, transfer them directly. If installing new bulbs, simply insert them into the sockets provided.