Narrow Car Booster Seat Anyone Know Of The Best Place To Look For A Narrow Child Car Seat(s).?

Anyone know of the best place to look for a narrow child car seat(s).? - narrow car booster seat

I drive a Volvo, you might feel it is a car that had the family room!
It was a struggle to put the 3 children in the back
Booster seats, but not with the promoters of the work