Certainteed DH spring balance

A contractor from Wilmington, De says:
For lower sash, 28x18 DH made 2005, spring similar to your S-170. I need both sides
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Tom from SWISCO responded:
I'm afraid I cannot identify what you have without more information. Could you show me a picture of the pivot shoe your balance springs attach to? Can you also tell me what is stamped on your existing springs?
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