Hey Fred...welcome to the Oldminibikes.com forum.
Member
@manchester1 makes beautiful seats, she can let you know if she has that pattern.
Otherwise there is member
@Arielsq who I don't see on here much lately. I believe he is a dunecycle enthusiast, and I think he's had some seat covers for certain dunecycle models.
Y'all chime in.
Enjoy the site Fred.