identify part needed

A home owner from Florida says:
January 14, 2017
markings found on 1/2" channel are the numbers 28-4...plastic piece is broken....I have order replacements before, but can't find invoice...My name is David
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
January 19, 2017
Hello, David. According to our records, you previously purchased our S380-29 channel balance with a 2840 option.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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