Amazon.com : 31MM X 22MM Telescope Secondary Mirror with Cell : Camera & Photo
Amazon.com : Astromania 2" SCT 90-Degree Mirror Diagonal with 93% reflectivity Across Visible Spectrum - fits Rear Cells of Schmidt-Cassegrain telescopes and Includes an Adapter to use with Refractor telescopes : Camera
Amazon.com : SVBONY SV138 Diagonal Mirror 1.25 inch 45 degree Correct Image Prism Diagonal Mirror Fully Metal for Refractor Astronomy Telescope with Dust Cover : Camera & Photo
Amazon.com : Celestron - NexStar 8SE Telescope - Computerized Telescope for Beginners and Advanced Users - Fully-Automated GoTo Mount - SkyAlign Technology - 40, 000+ Celestial Objects - 8-Inch Primary Mirror : Camera & Photo
Mirror support cell - Wikipedia
I Designed and 3D-Printed a Newtonian Reflector Telescope. The Views Are Amazing | by Rafael Fiol | The Startup | Medium