I don't think BMW allows you to customize packages. I would order sports package with 19s and trade them with 18s after delivery. You can probably work something out with your dealer? Or put an Ad here on bimmerfest.
2012 BMW X5 xDrive50i - Space Gray/Black/Dark Bamboo | Adaptive Drive | Active Steering | Prem/Sports Pckg
Retired: 2010 Audi S4
Retired: 2007 BMW 335i Coupe