It's semantics, but a side-to-side motion is "sway".
The torsion bars that connect one side of a car's suspension to the other is resisting the lifting of one side of a car compared to the other or "roll".
The bars are commonly called "anti-sway" bars, but are really "anti-roll" bars.
Think of an airplane rolling.
It gets confusing when discussing trailer towing issues because a trailer with too little tongue weight will have a tendency to sway side-to-side.
Trailer anti-sway bars work to control side-to-side motion.

 

Weight distribution hitch and bars.

 

sirkingdra, I've posted three pics of my rear anti-sway bar showing the anchor points. In case you're wondering, the black crap all over things is dirt and oil combined over the original Ziebart like undercoating. I'll be getting the truck's underbody oil sprayed next week again for the winter. The oil penetrates the metal and in turn, dirt sticks to the oil to protect the metal bits. I know that optically it looks bad but in fact, my truck is cancer free except for the surface crap. The trade-off is it looks really bad with that recipe caked on.

This first image shot from the front looking back and up shows the entire arm connecting the anti-sway bar (to the right) to the frame (going up). Looks like I need new bushings although the anti-sway bar doesn't rattle or clunk.



This pic below is shot front the passenger side, in front of the rear tire and looking into the rear wheel well shows where the top of the arm connects to the frame. Which on my truck, is behind and slightly to the left and below of the contact pad bracket for my upper helper spring (I have the OEM camper package).



Last pic is shot from the front looking back and shows where the anti-sway bar is secured to the axle, using a bracket, beside and to the left of the differential.



BTW - you can see my Sump Springs compressed in the last pic as I have my truck camper loaded in the bed of my truck. Normally there is about an inch of space between the bottom of the Sumo's and bracket when I am no/light loaded.

I hope these pics help orient you as to what holes to use. ~ BugJr ~

 

Not meaning to hijack, but the OP notes no lift. Which Hellwig part number for the rear sway bar is it when you are done with a small b/c mod spring lift for the Ex?

 

Just check the Hellwig website and enter your vehicle, it will list the part numbers and specs.

Mine took the 7643 before the spring mod, the 2"- 4" lift is the 7878.

Hellwig - Load and Sway Control Products

 

Good deal, thanks for that. Ordered the 7878 for mine after using the lookup tool. Amazon had the best price in the end @295