I managed to rip off the passenger side mirror on my 99 e320 4matic wagon. I have the housing, but need to replace the innards. Looks like t simple screws to take off the old and insert the new. The internet has a ton of options, though. Do I have to use the most expensive ULO version or can I go with the cheaper Kool-Vue? Will my old housing fit the cheaper Kool-Vue??? Thanks!!!