Since that time we've refined the design of the buckle system. What is currently used in our shoes in place of the Ultra SL system is the Caliper Buckle system.
These two systems are interchangeable on any of our shoes that feature either. However, the Ultra SL has been out of production for quite some time and is no loner available, but the newer Caliper System is easily used in it's stead and is readily available. See the links below for links to purchase from our website, or check out any of your favorite SIDI dealers. It should be noted that both of these systems require a matching set of buckles and straps. Purchasing one of each of the following items will bring any older shoes up to date or repair any current models.
Straps for Caliper Buckle