I'd like to get 18" wheels on a new MY06 Boxster S. I really like the look of the 18" Carrera III wheels that come standard on a Carrera Coupe. Unfortunately, they're not offered as an option for the 987S -- at least not according to the porscheusa.com site.

Does anyone know if a dealer would let you order a Boxster S with the 18" Carrera III wheels? (Is there any mechanical reason why these wheels are not offered as an option for the 987S?)

Interesting side note: The MSRP markup from the standard 18" Boxster S wheels to the optional 19" Carrera Classic wheels is the same as the markup on a Carrera Coupe if you choose the 19" Carrera Classics over the standard 18" Carrera III wheels.