Part from window on series 351 balance

A contractor from League City, Texas says:
January 2, 2020
This part mounts to the top of the actual window and seems to serve as a guide. It's in poor condition but I was unable to find one in your catalog that matches the part. I also need the bottom guide for the same window. Pictures attached. The balance spring has "05/22/04 Unique Balance 27D" printed on the spine. I believe I selected the correct balance series at 351. Any assistance is greatly appreciated.
Thumbnail of the uploaded file named 20200102_183919.jpg
Thumbnail of the uploaded file named 20200102_184110.jpg
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Casey from SWISCO responded:
January 3, 2020

Hello,

Your top sash guide looks like our 18-174 Alenco guide. Unfortunately, we do not carry the bottom guide shown in your photos. As for your balance, it is completely possible that you have the S351 but we would need to see a picture of the balance removed from the window to confirm since the stamp number does not indicate the correct balance replacement. Thank you!
A contractor from League City, Texas says:
January 3, 2020
Here are pictures of the balance.
Thumbnail of the uploaded file named 20200101_165138.jpg
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Casey from SWISCO responded:
January 3, 2020
As long as your balance's bottom attachment has a 1" depth as shown below, the S351-28 with a 2740 spring strength option will be the correct balance. If it's a little bigger, consider the S390-28.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
28" Series 351 Channel Balance
28" Series 351 Channel Balance
S351-28
$10.97
5/8" Top Sash Guide, Alenco
5/8" Top Sash Guide, Alenco
18-174
$1.96
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