Channel Balance Series 710 H-R40-48x84

A handy person from Ausin, Texas says:
I'm trying to replace my channel balances. The label on the window frame reads "Series 710 H-R40-48x84".
The channel balance on the right side (viewed from the inside of the house) is stamped 27-3 as seen in the picture. The left balance is too damaged to read the stamp but it appears it might say 27-4, but I'm not sure. I've enclosed pictures of the top and bottom of the balance. The metal portion of the balance measures 28 inches and is 9/16" wide.
Is the correct replacement S710-28? if so I'm not sure which option to choose. Do I weigh the sash and choose the correct weight range? Also, I'm replacing both balances, are the left and right balances identical or do I specify left and right when ordering?
User submitted photos of a window balance.
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Tom from SWISCO responded:
Good morning, and thanks for posting. Take a look at our 15-001 and 15-002 and tell me which is a closer match to the shoe on your existing window balance.
Comparison of <a href='Channel-Balance-Shoe/pd/Replacement-Sash-Support-Channel-Balance-Shoes/15-001'>15-001</a> & 15-002
A quick learner from Austin, Texas says:
Yes. The bottom appears to be a 15-001, and I believe the top is a 19-005.
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Tom from SWISCO responded:
Great. The balance that matches your old balance is our S395-28 with the 2740 option.
A quick learner from Austin,Texas says:
OK, so you think the Channel stamp of 2730 is the appropriate choice even thought the actual stamp says 27-3?
Also, you recommend S395 as the base series. I'm enclosing a picture of the label on the window sill that shows "series: 710SH". Is S395 the correct base series?
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Tom from SWISCO responded:
No, that sticker indicates the Series for the window sash, not the window balance. A stamp of 27-3 corresponds to our 2730 option.
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