Window sash replacement needed

A quick learner from Orange, CA says:
April 4, 2017
Sash stamped with: 29 9 IR CALDWELL

Need replacement.

Thanks.
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Tom from SWISCO responded:
April 6, 2017
I'm afraid that stamp doesn't tell me what you have. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have. I would also recommend weighing your sash on a scale to confirm the best spring strength option.
A quick learner from California says:
May 22, 2017
it's 1/2" x 30". the sash weighs approx. 38 lbs.

I believe mine is the;

30-inch/pd/Series-385-Channel-Balances/S385-30

I just need to confirm if I need the 2965 sash weight option?

Thanks, Tim
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Tom from SWISCO responded:
May 24, 2017
If the sash weighs 38 pounds, then the 2965 option would definitely be ideal. You may want to get the exact weight just to be 100% sure.
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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