Replacement Channel Balances 5/8" x 1-5/8"

A contractor from Hawaii says:
May 29, 2018
I need 2 pairs of replacement channel balances but don't have the old ones for a sample. The hole where the channel balance will fit is 5/8" x 1-5/8". The sliding window is 27.5" x 16.5" and weighs 6.7 pounds. The take out clip is intact. Attached are some photos of the window. Thank you, Jeff
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Paul from SWISCO responded:
June 1, 2018

Hi- thanks for reaching out!

Do you have a similar same size window in the house? If so, they would use the same size balance, if not you can show us the nylon end fittings on the side load balance. You gave us the size of the sash, 27.5" X 16.5", but what is the approximate size of the glass in the sash? May we also see the top sash guide in the sash? 
A home owner from Hawaii says:
June 3, 2018
Hi Paul,

Sorry I don't have another similar window in the house. I also don't have the end fittings. The glass size is 24 x 13". Attached is a photo of the top sash guide.

Thank you,

Jeff
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Paul from SWISCO responded:
June 6, 2018

Based on that information, we believe you can use S385-15 side load balances with a weight option of 1420, for a sash weighing between 6 and 10 pounds. You can weigh the sash to double check the weight option, if you want.
15" Series 385 Channel Balance
15" Series 385 Channel Balance
S385-15
$9.34
5/8" Top Sash Guide
5/8" Top Sash Guide
18-188
$1.44
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