Ran into the moco's touring solo spring seat (part # 51481-08) and it looks like it may address my comfort concerns. I want to go to a spring seat on my fatbob but worried about long trips. There is the attachment kit listed (part #54074-10) for the other spring seats but I can't find anything that says its compatible with the touring seat, which means it probably isn't, but wondering if anyone's tried it.

If not, any recommendations?

 

Ought to change my screen name to thread killer

 

That's a Softail seat.

Look at Mother Road Customs for many options for spring seats. They can build whatever you want.