Your custom fin blades can be fitted to most universal foot pockets that allow for a rubber side rail to be inserted into the foot pocket arms.  We recommend using the foot pockets own fitting kits to secure the fin blades into the foot pockets.  There are certain foot pockets (e.g. Pathos and Cetma S-Wing) that will require the fin blade to be glued into the foot pocket and this can be done by following the Pathos fitting tutorial that will be available on our Blog.  Take care if drilling holes and using screws, not to over tighten the screws against the fin blades.  The fitting screws should be tightened until they no longer turn freely but should not be over tightened against the fin blades, avoiding placing any undue tension on the blade.  We do not recommend drilling holes into the fin blades when fitting the fin blades to Cetma S-Wing foot pockets but rather gluing the foot pockets to the fin blades.