Hi
it might not give you the answer as i am not sure how the shape of the rear seats in the GC differ from those in the coupe?. However, i have both my kids in seats (one booster seat & one a full car seat using isofix - ages 3 & 6), and in fact the kids love it far more than my previous car with was a 4 door CLS. I would have thought if the seats fit in a coupe you shouldnt have any issues with a GC, given its more family friendly.
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CURRENT BMW: 2017 ALPINE WHITE 640D COUPE
PREVIOUS BMW'S: BMW 325 CI M Sport Coupe E46 / BMW Z4 3.0i roadster E85 / BMW 535d M Sport E60 / BMW 520d M Sport Business Edition E60 / BMW 730d M Sport. F01 / BMW 520d M Sport F10
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