At some point the Ottoman cavalry started to adopt the koncerz. And Ottoman miniatures can provide a wealth of knowledge.
http://warfare.tk/Ottoman/Suleymanname/Suleymanname.htm
Here is an illustrations from the Süleymanname 1558 showing Ottoman Deli Sinan fighting against the Hungarian Eugene at the battle of Mohacs 1526. Notice the koncerz under the deli's left thigh.
Another one from the same source shows a duel. Both combatants are equipped with koncerz' under their thighs.
In both instances, the Ottoman's koncerz has an "8-guard".