I have a 2003 fat boy solo seat I got a couple of weekends ago that I'm going to post here for sale when I get around to taking pics. I mocked it up on my 91, and decided it isn't what I want. Easy install, I was going to use a piece of 2" wide 1/8 inch thick aluminum for the front tab bent with about a quarter inch offset, and a piece of 4" wide 1/8 thick aluminum bent at about a 30 degree angle to match the bolt holes in the rear of the seat and the holes in the frame above the fender. Or diamond plate for that back bracket. I realized that with my arthritis, I slide back onto the passenger part of the stock seat to get myself high enough to get my right foot over the tank, and that wouldn't be possible with a solo seat. If you're interested, pm me.
1991 VN750, purchased 5/5/15, 9092 miles