He is 7 years old, 107 lbs, and 4'5". He is built like a linebacker - rock solid kid all the way through! He is over the 100 lb weight limit of his Graco backless and 3 lbs away from being over in his Chicco Kidfit. He is squished in and spilling over the edges of both. I don't want to buy another booster that will only get him to 120 lbs cause he will be there very soon and the largest width I could find was 17.87", which isn't enough to stop the spillover. His current boosters which are too narrow are 17" and 16". He needs one that is like 19" across. They don't make that size. I've read car seat adjusters aren't safe. I really am at a loss here. Does anyone know of an adjuster that IS safe? Thanks in advance!!