I bought a set of these off of Ebay a month ago and they look and work great. The resistors are built into the light. Just remove the old light assembly, unplug the actual light bulb, plug in the connector for the new light into the lightbulb socket, put the back-up light bulb into your new assembly and bolt it back together. It works great, very bright and looks awesome. If you like LED lights, these are great.