I'm looking for another set of rims to put on the Boxster instead of the 17" sport ones. I call;ed the dealer and asked them if they know of any other rims that would fit (VW or Audi) but I didn't get a straight answer. He tried to sell me a "package" of aluminum rims (17") with blizzaks for $1800. I need a more economic alternative like 16" or 15". Anyone knows what kind of wheels that will fit the Boxster?