Touring seat options for J-motor KZs

What touring seats were ever offered for these years? There’s of course tons for the Zs but not for the J, CSR, and LTD.

I realize there’s nothing current, but wanted to narrow my searches. I have a cafe seat now and I’m getting old. 

Corbin seats would my first choise for touring long distance rides.

www.corbin.com/kawasaki/73kz.shtml