Since there has been a lot of worrying going on about having one of the shocks "right-side" or "up-side" down or not I figured I would look into it. It took just a few minutes of searching and from the Harley website it says the following about the shocks (main points being nitrogen, emulsion, and MONOTUBE highlighted in red):
Experience the ultimate in superior ride quality with these Premium Touring Shocks. These shocks utilize a single tube, nitrogen charged emulsion design.
Standard Ride Height
Offers enhanced compression and rebound damping compared to the Original Equipment-style air adjustable shocks
Provides a controlled yet plush ride with less bottoming
Larger chambers (40mm diameter pistons and 14mm rods) allow these shocks to react more quickly to impacts - this keeps the tires tracking while minimizing harshness transmitted through the frame
Knob behind the left saddlebag allows the rider to conveniently modify the spring preload via a hydraulic adjuster
Available in Standard Ride Height and Low Ride Height versions
=================== End of harley website info ===========
============= Info found at a shock manufacturer website (Monroe) ==============
Mono-tube design
These are high-pressure gas shocks with only one tube, the pressure tube. Inside the pressure tube there are two pistons: a dividing piston and a working piston. The working piston and rod are very similar to the twin tube shock design. The difference in actual application is that a mono-tube shock absorber can be mounted upside down or right side up and will work either way. In addition to its mounting flexibility, mono-tube shocks are a significant component, along with the spring, in supporting vehicle weight.
============== End of shock manufacturer info =========
In summary, the shocks work the same no matter which direction they are in. I flipped mine the other way just for a clearance issue with the backrest mount. BTW I had the exact same issue with the Ohlins shocks I installed on my 2008 SG. I had to flip the right side to the opposite direction so the shock would would clear the backrest mount bracket. No big deal to me in that case either. Five minute job. They are behind the bags and out of sight.