I took a look at the link. That hardware looks very much like a closure I've used on some sporrans I made. Not proprietary at all. I bought mine from a local craft shop. Unfortunately, memory fails me as to exactly which one, so try checking "Michael's", "A.C. Moore" and/or "Jo-Ann's Fabrics". They sell them as purse clasps, or closures. There are several other types on the rack as well, and I've used a couple to good effect.