I got a new 30"
Series 385 Channel Balance from Swisco, and it did fit my window perfectly. But I figured that I am missing one of the plastic hook/shoe (I don't know proper name) that is screwed into moving window frame and holds the channel balance. I went through all the website and I couldn't find anything that matches the form. There is a picture of one that I have on the right side. I new a new another for left side.