Hi Debbie, Thank you for your enquiry. Depending on the model of the stroller, will depend on which clip attachment is required for this capsule. If your stroller is pre 2015 then you will require a Clip 23, if it is post 2015, then you will require Clip 32. As we are not stockists of Mountain Buggy we cannot confirm as to whether this capsule is suitable for this buggy. We would recommend contacting them direct to confirm and for these parts. If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our on-line store finder. Here you can find contact details for your nearest Baby On The Move store where one of our team experts can help find a suitable solution for a product you are searching for and assist you with any further questions you may have regarding our range of products available. We hope this has helped with your query.