SWISCO - The Replacement Hardware Authority

Help me find these balances, marked 34 DS 48L

A home owner from Florida says:
Need window balances marking on the channel are 34 DS 48L This are very heavy windows that are hurricane impact rated. The length of the channel is 35" (Metal end to metal end)
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting. You might want to check out our S390-35. Does this look like a possible match? Is the bottom shoe the same? Let me know what you think.
A home owner from Florida says:
This window is very heavy - I see that the sash weight for this is only 35 LBS - this window has to be about 50 LBS - do you have one with a double spring that will be able to support a window of this weight?
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Tom from SWISCO responded:
That's a very heavy window! Your balance may have to be custom made, in that case, but before we begin can you confirm the exact weight of the sash? That will let us know for sure.
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