Replacement window balances

A quick learner from Houston, TX says:
Please see attached pictures. The stamps are 27 4 lv cmc 7 and 27 kv cmc 7 respectively
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the S395-28 channel balance to your assembly. The 27 4 stamp indicates that you will need a 2740 strength option for your replacements. Thanks for posting! 

A quick learner from Houston, TX says:
What does kv or lv indicate?
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Casey from SWISCO responded:

That is just part of the manufacturer code but does not indicate any details about the replacement balances that you need. 

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