u/mrcrude

This has been discussed before but none of the past threads seem to provide anything definitive. We have a 5-year-old and are trying to find a backed booster that will work with the annoying Model X seats in either the 2nd or 3rd row. Nothing seems to work because of the shape of the seat and the headrests being static. There's always a gap. The only ones we've seen somewhat consistent feedback on are the Uppababy Alta V2 and the Diono Radian 3R. We just tried the Alta in the car at a store and there was a decent gap.

What is everyone doing for backed booster seats? Or are people just accepting there's a gap, which runs counter to the guidance from all the manufacturers?