Window balance needed

A quick learner from Tacoma, WA says:
This is 32 inches long (not including the clips). Its 9/16 wide and the channel is 5/8 deep. It says 31 D on it. Its totally missing the spring, so I dont know anything else from here. Please help point me to the right part, thank you!
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Casey from SWISCO responded:

Hi there, happy to help! I think this looks like our S351 balance. You'll need to measure just the metal portion to determine its length, but judging by your stamp it's probably 32". If so, you can go for the S351-32 with the 3140 stamp option. Let me know if you have any additional questions.

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