Digging out the archives as the job search goes on and on...
Ellis has a set of seats for a splittie for sale.

Middle:
Full length middle with the Golden "Salt and Pepper" material. White rubbery
hand grips with plastic base grommets. I have two clamps <not four>.

Rear:
Typical base and back. Gray vynil with sewn in vertical seams.

Condition Both:
Upholstery is tattered and needs redone. Frames are solid, complete, and non
rusty. Hand grips are in v. nice shape. Minor chip in one plastic grommet base.
Location is Phoenix, AZ.

Taking offers.