The ProTac Driver's Backrest
Here's a picture of the mounting bracket installation for the ProTac driver's backrest. The backrest is removable, so I just plug it on when I'm going on a long ride. It realy eliminates lower back fatigue. It's among the best money I've spent for backache prevention! You'll notice that the brackets fit between the "Fire and Steel" soft bag mounts and don't interfere with my side bags at all. Also, the backrest isn't in the way of the passenger.
This is a picture of the ProTac backrest on the scoot, fitted over the Mustang Wide Nostalgic seat. It looks as if it belongs there, doesn't interfere with the seat, and is clear of the passenger's legs.