06-08 uses H13. Be VERY careful when ordering a HID kit for your truck. They don't all work on these trucks. You need a special resistor and relay to make them work on the Ram or they will just flash and flicker and you will get a lamp out message on your cluster. There are a few places that sell Plug and play HID kits that come with harnesses that are prewired with these special electronics like HID Solutions - HID Xenon Lighting Specialists who has kits that include this harness and make installing hid's on 3rd gen's trouble free.