An adapter which connects 2-inch accessories to the 3.76-inch outer diameter for the Orion Sky Quest, XT Intelliscope Telescopes, (telescopes with Bottom mounting hole not circular).
This Scope-specific adapter fits into Orion Sky Quest Base 8", 10", 12", 14"XT Classic, XT Intelliscope telescopes with bottom mounting hole not in a complete circle.
Early 2013 Orion/Sky-Watcher changed the design of their stock base. This new base has the bottom mounting hole that is not in a circular pattern. Click the below link which shows a picture of the new new stock base that shows the bottom mounting hole NOT in a circular pattern.