Ok, The foot bed is just under 5" wide and 4" tall(inside). The slot is a little wider than 1". A 2" leather would go around the whole top of the stirrup. I have a pair on an aussie like that too. Your leathers may have a sleeve that will push down over the buckle on that size and hold the stirrup in the right direction. Did that make sense? ;) Also they make a pad for them if you need it. I don't know if I have an extra pair or not.. Pic coming soon.