channel balance spring

A quick learner from Sarasota, FL 34240 says:
I need a window channel spring ballance which is 29" long and has a number UB 28 D for the right side is an aluminum window 50" by 30" the spring has 2 white plastic clips on both ends. please give me a price for one with the shipping cost. thanks.
Douglas Chin-Yee
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A quick learner from Sarasota, FL 34240 says:
more photos to show the plastic clips
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Casey from SWISCO responded:

Thank you for writing in. It looks like you will need our S350-29, with the 2840 stamp option. Please let me know if you have any further questions. Good luck with your repair!

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