I also have the Progress rear sway bar. I just took some photos of mine for Mike at BWP. And, I can say that there must be a right way and a wrong way to install this sway bar. I compared my photo with the one you posted and I can see that the ends on my sway bar pitch out at the top while yours pitch out at the bottom. So I suppose I need to flip my sway bar around the other way.
Mine is a 2013 Rallye, early build. August, 2012.