Correct top shoe for model S380 of channel balance

As I go through the process, by process of elimination it appears that S380 is the match for my window channel balance. One question; the top shoe that comes with it (the 19-005) seems correct in terms of measurements but the picture seems to show a wing at the top of one side of the shoe. Note that I see both wings at the bottom and my model at my home agrees with that. The top portion as shown in the second detailed picture (on your website) seems to show one side as having a wing. Other pictures only show one wing on the top part of the picture. Weird...other than that it seems to work. Could you clarify if what I am looking at is correct and whether it makes any difference. I have attached two pictures of my top shoe (front and b ack) My width of the wings is 15/16 (same as yours). The withdh of the two prongs or forks in your picture is half inch. It is same for me. The measurement from wing to prongs is 11/16. same for mine. I have attached a picture from your website so you can see which picture I am talking about that shows the wing at the top.

Thanks for the response. I wasn't referring to the wings at the bottom(i.e. the wings that are measured at 15/16) but instead to the wing (singular) that appears at the top left.

Please see the picture that I am attaching. I saved your picture and drew a circle around it where I am calling this your top wing. It appears to be only on one side. It may be just optics but it does look like a wing on the top left side. My window channel balance has the bottom wings like your picture but not the top wing on the left side. am I seeing things or does this top wing exist in your picture and does it really make any difference.