Ok, you get 2 sticks of silent channel of 11 inches and 4 sticks of 5 inches per window.  Your drop light (door window) frame has a protrusion which will ride up and down in the fixed quarter light (wing window) frame channel. The silent channel fits into the fixed quarter light frame so that it will be on either side of this lip or protrusion. Are you with me? Got your windows and frames out of the door, well then you know what it is and where it goes! Please note these pieces are not really cut to specific lengths, we like to be generous with lengths just incase.