Over the years I have lost robo wings and have also made my own "teal" wings for use with robo dove.
This is the old style corrugated vinyl wings.
The replacement materials that I use can be found at Home Depot in the yard sign section.: Robo WIng
The 20" x 24" pc is big enough to make a couple sets of wings and the stand wire fits into the clamp on the decoy.
A lot cheaper than buying them.
The newer high end Mallard wings are metal and fold back. Don't loose those!!