Wish I had taken photo, but we ordered this:
http://www.ezsnapdirect.com/products
Note the small photo by RV Shades. They do not specifically show an order option for the awning shade, so I contacted them. The response was that they sell the material and snaps to be cut for window applications, but there was no reason it could not be attached to the awning roller. We measured for the width of our roller and figured the length that we wanted for height and ordered. It came with a large number of snaps. We followed the instructions and added the snaps every foot across the metal roller with the awning extended. The shade screen cannot be left attached to roll up due to the thickness, but it is easy to snap and unsnap for use and storage using the included tool. There were plenty of extra snaps and we placed a spare cap on each of the installed parts and added a felt sticky to provide a smooth surface that would not damage the awning when it rolls up on the roller. The bottom can be secured to an anchor or stake if windy. We are pleased with the function and appearance. The rolled screen is relatively easy to store when rolled side to side leaving the vertical dimension as the length of the roll to store.