What model and year Wing do you have? The reason I'm asking is some Wings, such as my 96 SE, came with adjustable rear floorboards, others do not and you may have to resort to aftermarket options.
I put on the same risers as flyinelvis ... my passenger absolutely loves them. A good feature is that they're adjustable without too much effort so, as needs change, the height of the boards can be altered as well. If you go this route, I recommend that you get a spare bolt from the local hardware store to carry with you in case cross threading occurs.
www.saber-cycle.com product ID 51-321, this is a nice bracket that you bolt your pass floorboards to and then it bolts back to existing location, it has 3 different adj to it, my wife is 5-1 and she loves the new height. and the are pretty cheap.
Hi 3 Wheeler ... I've found that I can still get the side covers off my GL1800 without needing to remove or otherwise adjust the risers. My set of risers is the Part No. BB52693 from Wingstuff. There's just enough space to be able to carefully remove the side covers and then to reinstall them.