Hi,
I have the same wheel setup on my 2008 4.8i and have had great luck with the Toyo Proxes STIIs. I'm on my third set of them now and use them for all year driving in the Midwest. Great in Snow and good grip level in the dry. They are a lot cheaper too, and look pretty cool, if you care for that sort of thing: https://www.toyotires.com/tire/patte...l-season-tires

Here is an option for getting the space saver spare:
getBMWparts.com - Exceptional Pricing | Unparalleled Service | Genuine BMW Parts

Enjoy!
John

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2008 4.8i X5 (2/25/08) 105k:
Titanium Silver/Black; All -HUD; Aero Kit; 22" VS-130 w/Pirellis;
///M Shifter & Fr Brakes; Gauge Rings; Console Pads; Custom Wheel & Mats; Roof Rails
Carbon Fiber: Int Trim, Nav Surround, Grill, Cluster Trim, Shifter & Eyelids
1.2" H&R; LUX AEs; LCI Tails; Rear Fogs; NBT EVO; ESS Tune; Meisterchaft GTC Exhaust