Clips that hook onto other metal clip on a pulley sysytem to open window

A quick learner from Visalia ca says:
July 8, 2018
Looking for parts for my aluminum windows. Anyone know what this part is called or part #? House built in 1982.
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Tom from SWISCO responded:
July 13, 2018

You've got a 15-209 end bracket, I believe!
Balance End Bracket
Balance End Bracket
15-209
$9.70
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
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