Amazon.com : Astromania Adjustable Guiding Scope Ring Set with Plate - 80 mm Inside Diameter (Pair) - for Telescope Tube Diameter or Finders 53 to 79mm : Electronics
Agena Telescope Tube Rings (Set of 2) - 3.5"
William Optics Mounting Rings for 80mm Telescope WE-MR-80 | 4 Star Rating Free Shipping over $49!
APM Telescopes. TS-Optics CNC Aluminium Tube Rings for telescopes with 80mm diameter
80mm Abs Astronomical Telescope Clamp High Quality - Instrument Parts & Accessories - AliExpress
Antares Telescope Tube Mounting Rings - 3.5" (90mm) (Set of 2) for many 80mm Refractors (Same as Orion) - Camera Concepts & Telescope Solutions
Tube holder with offset plate for FSQ-106ED ("New Q") refractor | Astronomics.com