I need to replace the rear spoiler(shiny black housing with rear lamp assembly) for a 2004 RX 330. I cannot find a part number or place to purchase one anywhere online. Dont want to go to dealer unless necessary.

 

Your best bet is to check ebay often as well as junk/parts yards. Any RX that is still on the road will be using theirs so you need a car that's not running. You can check both Sewell and Carson to see who can offer the better price.