If you have a Celestron C8, C9.25, C11, EdgeHD 800, 925, 1100 or Meade SC and ACF 8″ telescope and want to connect a Losmandy type bar under the telescope to connect it on a mount or set the same bar over to the telescope to support a parallel telescope, the best method is to fix these curved blocks that then allow you to connect the 350mm or 495mm Losmandy PLUS dovetail bar on the telescope.