Window is about 12 years old. Track I believe.

A home owner from Palm Bay florida says:
April 26, 2018
Balance is missing top shoe so previous owner screwed balance into side of window track.
Thumbnail of the uploaded file named channel balance, top missing
Thumbnail of the uploaded file named balance shoe
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Paul from SWISCO responded:
April 30, 2018

Thanks for reaching out to us. If the depth of your bottom balance shoe measures 1-1/8", then I believe you may be able to go with our Series 390 channel balance system. If I am reading your stamping correctly on the balance, it appears to read "2320". Please confirm that is the actual number on the balance. Should it be correct, then you want to go with a 24" metal length balance, giving you our product S390-24 with a 2320 option. 
24" Series 390 Channel Balance
24" Series 390 Channel Balance
S390-24
$10.55
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