My dealer told me the same thing...they will switch out the wheels for me at delivery and that I will have to pay for the difference. Sounds reasonable enough...that is until you hear the deal of what they will give you for your 17s ($400 for all tires and wheels) and what they will charge you for the 18s, 19s or 20s (MSRP). I almost couldn't give my 17s away and ended up selling it privately on Ebay for approximately $500. But on the other hand, I got a great deal on a set of 19s - type132 from a forum member for about $1500...so that made the pain a bit easier to swallow.