Hi All- picked up my new to me 2015 X1 tonight, but it turns out that the booster seat I've been using for my 7 year old is too wide to sit straight in the back seat. Anyone have advice on finding a narrow one that fits the contour of our rear seats? Best option I've found so far is the Clek Ozzi. I'd love to hear from anyone using it or another seat that fits. BTW, my forward facing seat for my 3 year old fits just fine.