Wally world sells the snap together button kit, but it is a pain to install(just like nets!). That Pro armor setup looks nice and obviously the strongest. I have bad ankles too(have broke both) BTW so I understand the importance of what you're trying to do. What boots do ya wear? Tech 3's for me.
buckles Look here:http://www.ahh.biz/hardware/tri_glides/tri_glides_black_plastic.html