If you look at the Kuryakyn site, the Big Dog adapters only list certain pegs as being compatible.
That's the reason I called the tech line and asked specifically about SwingWings. The tech said if the pegs aren't listed, then they won't fit due to the different spline shapes.
Fred, the pegs you used aren't on the list but they worked anyway. I wonder if they changed some of the fitments, or maybe the tech didn't know what they were talking about....
As a side note, still trying to get a different peg fit for my wife while retaining the V & H - BR.(Gotta love the long legs:2thumbs

Looking at the site, it appears that I may be able to use the 7947 offset mounts rotated slightly up and forward, and the SwingWings will fit above the exhaust.