Non Tilt vinyl single hung sash balance ID

I have a good idea of what you may have, but it's still hard to tell while the balance is still installed. The jamb covers up one detail that affects how the window operators. You see, there are two nylon attachments on the top and bottom of the metal channel and I cannot tell if they have wings or not. Can you confirm? Can you also tell me what the depth of the bottom nylon attachment is? This is the heel-to-toe measurement. Thanks!

Great, thank you. In that case, I recommend our S390-26 channel balance. See what you think.