SAS:
The H-25 or HUP had neither SAS or Fins..
Uh-oh! Don't mean to be disrespectful, SAS, and I certainly could be wrong about this...but I believe the HUP did have *both* of those things, depending on model.
HUP-1 had fins on the side of the aft cowling.
HUP-2 had no fins and a crude SAS.
HUP-3 had a more sophisticated SAS (that could, I've been told, autohover).
My dad flew the HUP-1 and -2. Said they weren't very pleasant to fly.