Here is a set of plastic side curtains that I believe fit a 28-29 Model A Roadster pickup.  I believe these would be an old aftermarket set since they are entirely clear plastic instead of having the fabric borders.

The door curtains are fairly clear.  They do have some scratches and stains as shown in the last few pictures but I think they are clear enough to safely use.  The rear quarter curtains are quite cloudy and also have some stains.  These were very dirty and I gave them a decent cleaning.  You may be able to get them cleaned up better with a little work.   The door curtains are 27-3/4" wide. and 21" tall.  The rear curtains are 11" wide and 12" tall.  They include the rods as shown.

See the pictures.