Recently had '04 Black Prius, it seem a Package #4 -- includes intermittent rear window wiper, anti-theft system and auto-dimming electrochromic rearview mirror with HomeLink, universal transceiver, and smart entry and start system. It is the only option & package sold here. Requested the installation at the Toyota Dealer of Fog Lights, after ordering parts they say it was not possible this installation because needed to change the wiring harnesses. I think it may be a warranty concern. Did anyone already do this installation at a Toyota Dealer?