Will these mount to my factory cab light locations without modification?

These are designed as direct replacements for Ram cab lights. Verify that your current fixture openings match the housing dimensions before ordering — test-fit ensures a clean install without additional drilling or bracket work.

Do I need to replace the wiring harness, or can I use the existing one?

LED assemblies typically work with OEM wiring, but confirm polarity before final installation. If your truck still has original incandescent sockets, a harness adapter may be needed — check your local electrical supplier for compatibility.

How long do these LEDs last compared to stock bulbs?

LED units outlast incandescent by thousands of hours and generate minimal heat, reducing strain on cab light circuits. You won't need replacement bulbs for years under normal use.