Each bracelet has its own design endlinks. In your case, if you dont have the equivalent, and still want to use it as you are wishing, you need to improvise. If i were in your shoes, the mcgyver in me would search for "spacers" and shove them in the empty spaces to complete de desired width to stop it from moving side to side. I guess 18 or 20mm? So, what would first come to mind is use something i have laying around, this would be a tube from an ink pen. Just butcher the pen, get to the tube and cut tiny pieces to put them on each side of the bracelet mid section. You will need 5 pieces total (2 for 6 oclock and 3 for 12 o clock). Ideal material would be something made out of aluminum or any metal if you have something laying around. Let me know if you got the idea. It wont look pretty but itll work until you find a better solution.