Need Window Balance

A quick learner from Valencia, CA says:
I would like to order new window balance. The old window balance is 32 5/8" long. I need an S380 type. The channel width is 1/2". The square hole in the jamb that the terminal clip goes in is 36" from the bottom of the window and 34" from the top of the window. Can someone assist me with placing this order?

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Mike from SWISCO responded:
Hello Andy, thank you for contacting us.

Can you give us the length of the metal channel only? Also, please give us any markings you find on the balance.
A quick learner from Valencia, CA says:
Hello Mike, That's just it. The length of the metal channel only is 32 5/8 inches. I studied the top and bottom plastic parts and the S380 matches perfectly except for the length of the metal channel. The only thing that is stamped on the metal channel is the number 32 3 then BS1 is stamped vertical then a tiny 0D stamped horizontally. I attached a picture of the stamp. I hope this helps. Thanks. Andy
User submitted photo of balance writing
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Donna from SWISCO responded:
Hi Andy,
Channel balances are only available on the full inch;
I'm not sure if 33" or 32" would be better for a replacement.
The 32 3 stamp translates to 3230 stamp option, found on the 33" length balance.
If you prefer to try the 32" length, choose stamp option 3130.

33" Series 380 with stamp 3230 will carry a window sash weight range of 18 through 23 lbs.
32" Series 380 with stamp 3130 will carry a window sash weigth range of 16 through 23 lbs.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A quick learner from Valencia, CA says:
Hi Donna, Thank you very much for the information and getting back to me. I'm going to order the 32" S380. I'm afraid the 33" will be too long.

Thanks again.

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