I believe all 2006 X3's have the sport bumper with the lower fog lights. All other years, only the sport model has the sport bumper and thus the lower mounted fog lights.
If your 2006 X3 has painted wheel well trim, that is an indication that it has the sport package. If the wheel well trim is black plastic, it is a non-sport model.
2013 535i - ED, Oct 2012 | Cashmere Silver | Oyster/Black Nappa Anthracite | ZCW | Sirius | Air Blue 80
2008 X3 | Monaco | Sand/Black Light Poplar | ZAP | ZPP | ZCW | Xenon | Rear Fog
1988 Grand Wagoneer | Burgundy | Ghost Flames | 360 ci | Holley carb
BMW CCA #422951