Farpoint's Dovetail Plate for the Celestron 8" is compatible with "V" sized (Vixen) saddles and telescope mounts that use this size dovetail bar. The radius blocks and screws required to mount the dovetail bar on the Celestron 8 OTA are included. Rounded corners and chamfered edges on the Farpoint Dovetail Plates allow for smooth set up even in the dark. Measurements are 13.5" long, 0.5" thick Farpoint dovetail plates are compatible with Vixen style dovetail accessories!