Any of the string makers can help you out. You can also get modern string materials and have the loops padded (extra string tied in). I don't know specifically the length your bow needs, but typically, a 60" recurve will need a 56" string. One way to be sure would be to make up a string that has a timber hitch in one end. You can then adjust the length to what you need. Once you settle on what you need, use the timber hitch string as a backup, and order a new string with loops on both ends.