coil spring system

A home owner from Minnesota says:
Just following up with more pictures to an email I just sent.
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A home owner from Minnesota says:
Looking to replace both sides of these. Window is 35.75x37.50. Order number 4492343702.

Hoping to get the right part number to order.
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A home owner from Minnesota says:
Looking to find the part number to replace both side of this window and the piece that goes into the slot. The one picture shows the only number on the spring I could find.

Thanks,

Dean
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Bob from SWISCO responded:

Thanks for writing in. There's a few issues to tackle here. First, your pivot shoe can be replaced by our 15-192--but your shoe is actually for a Simonton window, and the metal cam is a bit different than what the 15-192 has. Because of this, the 15-192's metal cam will not be compatible with your pivot bar. Save the metal cams from your old pivot shoe, and swap them out with the ones that come with the replacements. For a new pivot bar, you need our 26-336.

The 15-192 pivot shoe is compatible with our Series 170 and Series 171 Coil Balances. The Series 171 is used for the second coil spring, and stacks atop the Series 170. A stamp of '407' suggests that you need at least the S170-407 7 lb coil spring. If you are uncertain what else you need, weigh your window sash. Give us the exact weight,a nd we'll work out what you need. 

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