Please help me repair my balance

A home owner from Hollywood,Florida says:
I'm planning to repair my "no tilt" sash window (Pan Am channel balance replacement).The two problems that I have are:The lenght of the metal of such balance is 18.5" and also the guides are the questions are:how to order base on the size 18.5" or 19"? and how to install back the channel balances with the winged guides into the grooves on the frame?...(original guides are broken and similar to your part #S377-19)..could you help me?,Thank you.
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Paul from SWISCO responded:
Thank you for posting. For the length, I'm not sure. Can I see a picture of the balance held next to a tape measurer? That would help us determine what route you should take.

As for how to install the balances, take a look at the video below to familiarize yourself with the generic process.
A home owner from Hollywood,FL says:
Dear Paul:Thank you for responding.I'm sending the pics of the balance next to a measuring tape as you requested.The balance has a #1840 stamped on it.
User submitted photos of a window balance.
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Paul from SWISCO responded:
Great, thanks. We can make this balance for you, but it will have to be a custom job. Check out this Custom Channel Balance Order Form that I've started for you and fill out the rest of the information. One of our representatives will get back to you shortly thereafter with a price quote.
A home owner from Hollywood Fl says:
Dear Paul:Thank you so very much for the help and the excellent customer service...I did place the order already.Best regards,Pedro.
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