The Chief slip-on bonnet specially created to slip over Indian factory fender bonnet lights.  Eyes are bored out with clear glass inserts in order to let light shine through.
To determine which size you need:
For the large bonnet, measure from the top of the black headdress, over the nose, to the front tip where it touches the bike. You should get measurement about 3.25”. May also be determined by printed letters around the front base.