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Antares Telescope Tube Mounting Rings - 3.5" (90mm) (Set of 2) for many 80mm Refractors (Same as Orion) - Camera Concepts & Telescope Solutions
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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
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Inner Diameter 80mm 90mm 100mm 114mm Tube Ring Hoop Metal Clamp Ring For Fc60 Monocular Stronomical Telescope Accessories (pair) - Telescope - AliExpress
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