Booster seat width

Hi Helen, thank you for your enquiry, the head wings on the kid guard will affect having three across the back, however, the Evenflo Big Amp booster is our narrowest seat at 40cm width. I had added a link for you to look at:  https://www.babyonthemove.co.nz/hire_products/hire-car-seats/evenflo-big-kid-amp-booster?search=big%20amp . We hope this helps. ?For further information on this or any of our other products available, if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.