ARE ALL SIDI BUCKLES AND STRAPS INTERCHANGEABLE?
All side mounted buckles share the same attachment screw. The ratchet straps specific to each buckle fit interchangeably into the slot in the outside of the soft instep closure system. So there is no problem retrofitting an older SIDI shoe with the new SIDI Caliper buckle, just make sure to replace the ratchet strap at the same time.