You can fit bits to a rocking horse in a number of ways. Most realistic is to use one of the cast brass bits shown below, size depending on the width of the mouth. The fulmar bits are joined by a brass wire, this is nominally sent out as 3" wide. If you need different please purchase as normal then email sally@sallysrockinghorses.com with your order number (begins RC....). Our spring O rings are another way and much easier to repair with say broken reins as any existing leather loops or D rings can simply be inserted into the ring opening.