which window balance do I need?

A home owner from houston, texas says:
June 5, 2017
I have a non tilt,sliding, double pane window. The sliding part is 30x45.

The balance is 28 inches long. I've attached photos of the markings and the top and bottom ends.

I need to know which of your models I need.
I appreciate your help.
Thanks,
Jim
Channel balance
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Tom from SWISCO responded:
June 7, 2017
Hello Jim. Thank you for your post. Please take a look at our S395-28 channel balance as a possible replacement. We would like for you to weigh your sash on a scale in order to choose the best option.
24" Series 395 Channel Balance
24" Series 395 Channel Balance
S395-24
$10.03
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