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/SkyWatcher changed the designe of their stock base. This new base has the bottom mounting hole that is not in a cicular 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.
Use with focuser FTF2025BCR