Dear Nan, the double ring is the Single Corner Ring x 2, so we just need to add those 2 designs to 1 order, for the sizes, I will check later when I am home. We have chosen the original Rhino size 52 as the smaller size for the directional ring only as the ring turned out to be smaller, we made a new 52 Rhino only for this model, the original mould can be used for size s,