Would this seat be suitable for a 99 Honda Civic?

Hi Monica, thanks for your inquiry, we would highly suggest taking your car into your local Baby On The Move Store so that you can have the seat tested in your vehicle, the seat is size depend and may not fit based on what model you have. 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.