When you like to use the Ponytail with SaraSpriteling it's really easy to make it fit.

Load the hair, then you go to the SaraSpriteling Pose folder and click with the hair selected on !Deform Libary Hair and after that (with still the hair selected) on !!Instant Human or !!Instant Elfling (depends on what morph you have used on Sara) and that will put Vicki's Changing Ponytail perfectly on her head. All you need to do is parent it to her head that it stays there when you move her around but you do not have to use the dials to get it into position.

Btw, using this poses will make every hairfile fit to Sara.

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