spiral balance

A quick learner from florida says:
window weight is 17.6 pounds
esp of florida is the manufacturer
measures approximately 29 7/8 "
white plactic cover over balance
could be 9/16 wide. would a 3/8 work
30" long
has two pins in the bottom like the 900 series
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Casey from SWISCO responded:

Hello, thanks for writing in. Assuming this is for a tilt window, the exact diameter of the outer tube is going to be crucial. If it is 9/16", then that would be our Series 600. If the length of the outer tube is 29 7/8", then you'll need our S600-30. Finally, a 17.6 pound window would correlate to a red tip. Please let me know if you have any further questions. 

S600-30 : 30
30" Series 600 Spiral Tilt Window Balance
S600-30
$9.40
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