Which part should I order?

A quick learner from California says:
October 24, 2019
Hello,
I'd like to replace both (left and right) Channel Balances on my sliding window. Attached is the pic of the old one, but the letters don't match with what you have in your catalog. Which part do I order? And does it matter if it's a left or the right side? Also, do I need to replace the plastic attachments, or I can re-use the existing ones?
Thank you for your help!
Thumbnail of the uploaded file named Window replacement part.jpg
A quick learner from California says:
October 25, 2019
Hi,
I did some research on how to identify the part. Based on my old one (pictured above), it looks like I need to order S385-27 with Option 2640. Please confirm I ordered the right one. Thank you!
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Tom from SWISCO responded:
October 29, 2019

Thanks for posting! I'm afraid the stamp alone doesn't tell us what Series you have. Series is determined by the style and size of the nylon fittings, which I cannot see in your photos. 

The S385-27 comes with a 19-005 top and 15-004 bottom. As long as those match what you have now, then you should be good to go. I can at least confirm that the 2640 stamp is correct.
26" Series 795 Channel Balance
26" Series 795 Channel Balance
S795-26
$13.45
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