window channel balance Marked 2906

A quick learner from Palm Coast, Florida says:
need replacement balances.
I replacing at 2 different houses.
#1 is balance marked 2906
#2 is balance marked 2940

2906 is ribbed on side, 2940 is not.

Other then that they look the same.
Both are 30" long.
Both have same tops and bottoms.
User submitted a photo of a window balance.
A quick learner from Palm Coast, Florida says:
My concern seems to be bottom shoe. Closest I could find is 15-005 which measures 1" deep.
What I have appears to measure 7/8" deep.
Weight of sash is 33.2 lb.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! We don't have any shoes with a 7/8" depth. It's possible that your shoe has worn down from age and use. Even if you need something smaller than 1", you could file the 15-005 to size, if necessary.

With that in mind, what Series is closest? Could you have our S380-30?
A quick learner says:
I believe the S380-30 would be correct.
I too thought perhaps the shoe had worn down but wasn't sure.
As you stated, I could just file it down some if needed I suppose.
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