As I already owned a pair of Elite rings, I figured out a cheaper solution in order to extend my practice to the lower body exercices :
I bought a pair of straps sewn as a ring used in climbing, called runners. They come in different length, and 12" is enough. Resistance is not a problem : they can support 4950 lb...
I just fix them to each of the Elite ring with a knot known as a lark's head. Et voila ! (I am French
), for a mere 10$, you extend the versatility of your rings ! 