Window Balancer Parts

Hey Joe. This might be an S380-30 Channel Balance, but it comes down to the depth of the bottom nylon fitting, or shoe. The depth can be thought of as the 'heel-to-toe' measurement. See the image below for a depiction. The Series 380 has a shoe that is 1" deep; it's closely related kin, the Series 385, has a depth of 1-3/32". 

I suspect however your balance's shoe might be less than 1", perhaps 7/8". That's why I'd like you to measure and confirm. If it's a 7/8" deep shoe, you'll need balances custom built with this shallower shoe attached. We can do that for you no problem. Just confirm for me the depth and how many balances you need, and we'll go from there. Thanks. 

Comparison of the S378, S380 and S385 balance shoes.

Do you mean that the depth is 3/4" rather than 7/8"? Either way most likely you need balances with our 15-029 shoe. I just sent you an email with a custom link to order (18) of these balances as requested. Please double-check and confirm that shoe depth before proceeding with an order. Let me know if you have any questions prior to placing your order.