What sash balance do i have?

A quick learner from CA says:
Is this the correct replacement: 32" Series 350 Channel Balance / Product Code: S350-32?

my stamped #s are 310S 30

32" in length / 9/16" width / 5/8" depth

my plastic ends match your pictures

just don't know about the 'stamp option"

Window is H-LC30-44x77
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Tom from SWISCO responded:
The the nylon attachments are the same as our Series 350 channel balance, then that's what I would go with. The option is based on your stamp, though I don't recognize yours. You will need to get the weight of your sash and compare it to the chart we show on the S350-32 store page to determine what will work. You can determine the weight of your sash by simply removing it from the window and weighing it on a scale.
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