Is this capsule suitable for a 2003 holden

Hi Zane, thank you for your inquiry, the Safety first with base should be suitable for your vehicle, however, we do recommend popping into your local store so that a trained car seat technician can try this in your vehicle for suitability. We hope this helps. 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.