Nylon stabilizing end parts

Hello there!

Thanks for reaching out to us. Your channel balance looks like a match for the Series 700. To determine the length of your replacements, you'll want to measure only the metal channel. You will also need to weigh the window sash on a scale to determine the proper stamp. There is a chart under the product description on the S700 store page that you can use as a reference. 

Let us know if you have any questions!