"So I ordered these mesh lumbar supports online, doubled them up for added strength, then mounted them to the tub with suction cup hooks from Dollar Tree.

I more recently acquired an old office chair my neighbor was throwing out. The back is mesh with a more sturdy reinforced plastic frame. I just have to figure out how to securely mount it then I’ll have a good replacement for the one in the photo.

I think I’ll just use bigger suction cups mounted directly to the chair frame. I actually have some in mind that clamp down very securely"