William Optics Mounting Rings for 80mm Telescope WE-MR-80 | 4 Star Rating Free Shipping over $49!
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
Amazon.com: Omegon 90mm Tube Clamps for 80/400 Telescope : Electronics
Inner Diameter 80mm 90mm 100mm 114mm Tube Ring Hoop Metal Clamp Ring For Fc60 Monocular Stronomical Telescope Accessories (pair) - Telescope - AliExpress