Not a problem, we couldn't find what we wanted at CostCo. We bought at Discount Tire.
MAKE sure the tire pressure is set correctly
BEFORE you "initialize" the system.
Go to pg 49/50 of you Owners manual
or here.
http://www.x3world.com/ General Info & Guides
which will take you here.
http://www.bmwmotorsports.org/pdf/BM...20-%202005.pdf
ab