One Piece driveshaft length

There is no such thing as a true 1 piece driveshaft for the new stangs. All of the new so called 1 piece driveshafts cost so damn much because there is a splined section that makes it able to move in and out a bit with the suspension due to the lack of a slip yoke on the transmission. I have a JPC aluminum shaft, but I'm not sure what the length is. It's much lighter though.