Help identifying replacement 27 4 F O Caldwel balance

Home Owner from Arlington Heights, IL
Gentlemen:
I need to replace four window channel balances. The Balance measure 29" from the bottom to the top of the top balance shoe. The channel of the balance measures 9/16" square. I have attached pictures of the shoes and I need your help to recommend which model balance to buy. The balance has the following stamped on it: "27 4 F O Caldwell".
User submitted photo of their 27 4 F O Caldwel balance.
2 Replies
Casey
Casey from SWISCO
SWISCO
Expert
Looks like our 28" Series 380 balance. For the stamp "27 4" choose our stamp option 2740.

Let me know if you have any additional questions.
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