I've seen and tried a few different solo seats out there. Most of them are better than stock but none of them are as large or as firm as I want. The stock seat is too soft for any serious seat time for me, I'm uncomfortable after and hour. I currently have the stock pan repadded and custom shaped with stiff, high density kayak seat closed cell foam. Not perfect but I can spend as long as I want in the saddle.
I really liked the Corbin seat I had on my Kawasaki, my wife and I could spend all day on it with no trouble at all. Corbin does make a solo seat that's designed for early Harleys but it's a bit on the large side (don't know if the pillion and sub-frame would still fit) and I'd have to cobble together a mount for it myself. The price is well over $300 so it's not something I can easily experiment with.
So what I'd love is a Coobin seat that matches up to the stock mounts and is close to the overall dimensions of the stock seat so I can still fit the pillion on when I want to.
All that said, I know I'm high maintenance in this area
I want something very particular that might not be to everyone's liking. I like my seats very firm. Most people poke my current seat and give me looks like, "How can you even sit on that?" Still, if Corbin wants to make it then I'll probably buy it! I would like their dual seat as well. My wife still hasn't been on the bike yet, we're new parents and just don't have the time to ride together, but I'm sure that it would be far better than the stock pillion. Still, I want a solo too that fits well with the bike and works for me when I ride solo. And if there was a super quick change mechanism so I could swap the two in less than 10 seconds that would be ideal. I mean, since you're asking
Scott