Window part

Hi there. This looks like a Series 370 Channel Balance. To determine the length, be sure to measure just the metal channel; do not include the nylon fittings in this measurement. Finally, to determine your stamp option, look for a stamp code somewhere on the metal channel. If there is none, weigh your window sash. You can then match that exact weight with one of the weight ranges listed for each stamp option on the product page.

Yes, the nylon attachments come fitted with the Series 370. And yes, sounds like the S370-27 with a 2610 stamp option is what you need. Let us know if you have any other questions!