Thank you for being such a long time AXO customer. If a replacement is not listed in our accessories pages of the catalog, most likely it is not available any more. In this case you have two options. If your boot were manufactured after 2003 (starting from style RC 6, MX2, RC6 Jr on) you can just buy a set of new buckles and you will be able to retrofit your boots. If this doesn't work for you (All RC boots before RC6, Turbo and MX1), then just open a ticket from our Help Desk and possibly attach an image of the boots: sometimes we do miracles.