New here and need a little help. My wife's 2002 Avalanche has the heated and auto dimming mirror on the driver's side.Pretty sure it has the puddle lamps. It has gotten to where things look double in it especially head lights so I need to replace it. I have found places that have replacements that have a part number for power, heated or power heated DL8 option. What is the DL8 option? I really don't need the auto dimming if that os what it is. Call Chevy part and they wanted $550 which seemed crazy to me. Heck the motors and all work just a replacement glass part would fix it.