I believe that you can get them from Grace directly and I am sure they are available from other sources too. They are farily simple to make. The sizes required should be somewhere in your instructions and I just serged 3 edges of the fabric and made a pocket for the tubing to slide into and then pushed the leader into the rail and then pin the quilt top and backing to their leaders and to the takeup leader (I know clear as mud right). You can google quilt frame leaders and you will get some videos etc to check out.