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I use an hd sundowner for 2up. Same seat for 06 Fatboy and 05 Heritage. It is a very comfortable seat. It sits you back and lower, with a little back support, and has a wide and thick pad for passenger. Dont think you can add a back support driver pad. The dealership will let you test ride their seats. Also, the sundowner come up for sale used often in this site and can be had at a great price. Got mine locally on CL for $100.
For a 2up seat with a driver back support you probably need to look at something else like a Mustang.
There are many seats on the market that look "Cool" if your bike is for show. If you bought your Harley to ride, then go with a Mustang Wide Vintage Solo. You can add a back rest and or passenger pad if necessary. Check out their web site.
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