Updated the mount again using two different Rizoma extender kits - had to modify bits to make it work but it is much better than the original HD curved extenders I posted earlier. Note the Puig Trend Windscreen.
Finally got the mirrors in a position that works, allowing me to see what's behind me and not just my biceps or hips (LOL!!). It's kind of Rube Goldberg-esque using a combination of H-D's and Krator's extensions. I tried each kit separately, both above and below the handgrips and this is the best setup for seeing behind me. It unfortunately is the least esthetically pleasing solution. I wish H-D or some aftermarket mfr. would build a pair of L O N G stemmed mirrors!