Window sash

Thanks for writing in. This actually isn't a Series 385 or any other standard channel balance. You'll note that the wheel with the clip at the end of the cord rests in your balance's nylon shoe, rather then within the metal channel; this is a special type of balance that we can replace for you, but it will have to be a custom order. I am sending you an email with a custom link to order (2) of these balances. If you need a different amount, just let me know and I'll send you an updated link. Let us know if you have any questions. 

OK! I have sent an updated link to you for an order of (6) of these balances. Let us know if you have any other questions.

Not to worry. We already assumed a length of 19-5/8". You see, this particular kind of custom balance always comes in X-5/8" increments. As soon as we identified the balance from your pictures, we already knew to account for the proper length.