Most moris sides have a specific pattern for their bell pads, and many have a tool for punching leather etc, bells etc. You only have to cut out the required shape of leather and punch the holes for the bells and elastic/ties. The holes for the bells should be just large enough for the ring on the back to push through, the bells can then be secured by passing a piece of leather thong or a bootlace through them from the back. The advantage of attaching the bells this way is that it's easy to do running repairs without a needle and thread.

Where do the rest of your side get their bells from anyway ? If you really don't want to make your own, offer to pay another member to make you a set.