Lost my rear fender plastic, and was shocked and unwilling to pay the price asked for a new one
I came up with using the lid from a rubbermaid roughneck tote lid.
You can find these lids at home depot or lowes or wherever.
Unfortunately you will have to buy the tote as well, but hell you can make a rear fender out of that thing too...lol..
anyway. All I did was use my other fender and trace out the shape (lay it upside down and trace) and cut with some scissors. Tucked the ends under the seat and bolted down.
Since I lost my right side (exhaust side) I lined the inside of the plastic with some thermal tape that I had laying in the garage.
This mod lasted around 6k of a coast to coast and back trip. the plastic eventually tore because I didnt even use any washers on the mounting bolt, eventually wore through the plastic and blew off again against the wind. I suspect if you use large locking washers it would last much longer.
Total cost including gas under $25
The first pic of the red one is my beta version that i used an old top that was sitting in the sun for way too long.