Keystone window part

A quick learner from USA says:
March 20, 2017
Hi, there is no brand on my window (50" W x 60" H), but something referring to "Keystone", and model 1000SH about glass, etc. I need this part/spring and 2 white plastic pieces. All that is stamped on the spring is 28F. Please let me know if you have, or can help me.
Thanks!
Diane
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
March 27, 2017
Hello Diane. Thank you for contacting us. Take a look at our Series 380 and Series 385 channel balances. You will notice that they have different shoe sizes. Review the diagrams below balance shoe 15-004 with the Series 380 and Series 385 shoes side by side. The white pieces you are referring to are known as top sash guides. We recommend that you take a look at our 18-180. Let us know if you have more questions.
1/2" Top Sash Guide
1/2" Top Sash Guide
18-180
$1.67
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Replace a Top Sash Guide [1080p]
How to Replace a Top Sash Guide [1080p]
VIDEO
WATCH >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.