You may also want to look at The Ultimate seat http://ultimateseats.ca/. They have a 2 week return policy. Ride it for 2 weeks and return for credit if you don't like it, paying for return shipping. It also accepts a backrest.
The Mustang Vintage Solo and pillion seats have been my favorite for many years. They just always seem to support my back and butt better on long rides.
Mustang Vintage Super Solo (79446)...did 4,040 miles in 10 days on it with 1,000 of those on day #9...
That Mustang Super Solo looks real good, however it looks like it only fits HDs back to 08. Mine is an 06. They make a solo for it, pn 75578. It is not a wide as the super solo, I think its about 15". I had one on a previous bike and I liked it, never a case of monkey butt.