A bit over a year ago I surveyed this site asking for input on the best back rest. Overwhelmingly the response was for the Utopia Back Rest. I don't recall what number two was, but I do remember that it wasn't even close. See Drivers Back Rest Recommendations
So anyhow, I bought a Utopia Back Rest. One of the best upgrades I've made to the bike. Particularly on anything over about 200 miles it's a life saver! I only wish the O.P. had put this one up for sale when I was looking to buy the one I have now!
To the O.P. There are, or were, two different mounting brackets from Utopia, depending on the year of the bike I seem to recall. You might edit your post to let folks know which one comes with the back rest you have.
Current Bikes: * 2015 Harley-Davidson Ultra Limited * 2013 Honda Goldwing Air Bag
* 1971 Triumph Bonneville