29 3 IV CMC 7 Milgard Window Balance

A quick learner from Livermore, CA says:
I would like to know which replacement part I need.
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Emily from SWISCO responded:

Hey there!

Your balance looks like a match for our S380-30 or S385-30 channel balance. You'll notice our Series 380 has a 1" deep shoe, while the Series 385 has a 1-3/32" deep shoe so you'll need to measure as shown below to determine the best match. You will also need the 2930 strength option. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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