[MnMadhouse]

Make sure your 7 y/o that is in the backless booster has a headrest behind him. You will have to call your dealership about the extender, but I would just have him get in first, move the other booster out of the way a bit, buckle, then that child get into their booster.

	Booster Seat A booster seat raises your child up so that the car's lap and shoulder belts fit correctly. The lap belt should fall across the upper thighs. The shoulder belt should go across the middle of the shoulder and chest. A booster seat is used for older children up to about 80 pounds. Some states have passed laws requiring booster seats for children up to age 8 or 80 pounds. Check your state's law.