Channel Balance

A quick learner from Austin, TX says:
Can you please help identify the replacement channel balance?

The Metal part is 28" long
Width = almost 1/2"
Stamp says: 27 6

Also can you please suggest the appropriate Top Sash Guide with correct screw?(screw is missing)

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for contacting us. Start by looking at our S395-28 channel balance and 18-174 top sash guide. Just make sure that the dimensions match up.
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