GOWE New Telescope Tube Rings with dovetail mounting plate 96.5mm - Amazon.com
ADM Accessories | R150- 150 mm Adjustable Rings with Thumb Screws
Optical Tube Rings for Telescopes at Astronomics | Astronomics.com
Parallax - 12" Extra Heavy Duty Tube Rings- for 10"-12" Refractors | Telescopes
Amazon.com : SVBONY SV116 Guiding Scope Ring Kit for Telescope Tube Diameter or Finders 43mm to 70mm with Pair Ideal for Astrophotography : Electronics