Channel Balance ID

A home owner from USA says:
Thank you for helping us select the proper parts for the window Channel Balances.

Included are the pictures of the balances.

The tops look like #19-002 and the The bottoms ????

The metal channel for the 2 sets that I need is 28" (option 2750)

The metal channel for the 1 set is 22" (option 2140)
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello! The bottom is a little weight. I wonder if it matches our 15-001? Carefully compare dimensions and let me know. If so, I would recommend our Series 390 channel balance, which comes with the 19-002 top and 15-001 bottom already attached. Let me know what you think.
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