Need constant force springs for shash window

Greetings. Can you show us the pivot shoe that this coil balance connects to, or the part towards the bottom of the window track with a cam from which the window pivots? The identity of the pivot shoe will determine the identity of the coil springs. Also, the stamp code on this spring is a little unusual. Can you provide us the exact weight of your window sash? If you can do that, we'll be able to tell you the specific spring weights you need to support this window. Many thanks.

Perfect, thank you. This looks like a 15-175 Coil Balance Shoe, which uses our Series 152 Coil Springs. If your window weighs 12 lbs exactly, you could use (2) of the S152-6 6 lb Coil Springs, one for each side of the window sash. This would total the 12 lbs of needed support. Let me know if you have any other questions. 

You sure can. All orders can be placed online. When you find a part you want, simply click "Add to Cart," and then click "Checkout" at the top right hand corner of the screen. Don't forget to set the quantity!