No, all Ebodies did not come with sway bars. My car came with neither front nor rear. The sway bar lower control arms have the mounting tabs and non sway bar cars had no mounting tabs on the control arms.

Addco bars bolt on to control arms without tabs? Interesting. I also noticed firmfeel has kits for cars that did not originally come with bars. Maybe they use something similar. Does anyone have pictures of how these "tabless" sway bar setups mount?