@Wish - Oh yeah I did see something about the tail will allow you to change it from a 65 to a 66 - which then means you need to be able to have the fin block move with the increased length... I assume that is what they mean
63” includes VT, VS, VR, and VT+ Versatail blocks
65", 66”, 67”, and 68” includes VT, VS, VR, VRS, and VSR Versatail blocks