Fits perfectly and my son likes to sit in it. Have him bought used and mounted without screws. Is also wonderful in single-seaters. The previous speakers have written very witty reviews. The straps are inserted through slots and thus are not behind it. The baby will be just belted as usual, with the straps of the trailer. The child is and is not. Maybe you should just watch assembly instructions on youtube. Great product. The baby is better than in the stroller.