I don't think there is a real reason to change that, but if you want to I bet it is just in the comp...also won't you have to latch the 2nd buckle so wouldn't it be the same amount of effort to just buckle your seatbelt (and a lot safer)

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options