I measured from steel end to steel end 30 inches. The plastic hardware is the same as the 29" series 385 channel balance. The number stamped into the bar reads 29 9 BSI RK. I would like to order this part from you. My name is Shon Murray. Thank you!
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Casey from SWISCO responded:
May 21, 2020
Hello, If the attachments match up to the S385, including the depth of the bottom attachment shown below, then you should be in good shape. A few things to consider would be that your stamp indicates to me that your metal channel probably measures 30", so you would need the S385-30. Also your stamp number is part of an outdated weight system, so you'll need to weigh your window sash and choose your spring strength option based on the chart under our product description. Once you've confirmed exactly what you need, you can place an order directly on our website or a customer service representative would be happy to help you place an order if you call 856-317-6263 during business hours. Thank you! 
Alternate view of 15-004
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