That's a very good point. There really isn't all that much "strength" holding on the front bar, and it sees higher side loads...Think about the front bar attaching point for the bushings. There are four relatively small bolts holding the bushing plate to the frame. The muffler clamps appear to be far stronger than those bolts so I would judge that the attachment of the anti-sway bar to the axle is substantial. I've checked mine and it has not rotated or shifted whatsoever. I don't baby this car in the turns, and it gets a good workout as a wagon. The rear end links are also rock solid, and sit as close to perpendicular as my eyeballs can tell.
Worst case, I'm out what, 25 bucks for a boneyard bar? I think I'm going to try it when I do the SS rear in the wagon. It'll save me some "up front" money for beefier control arms.