Searching for 27B BSI TK

A quick learner says:
I need to fix several windows where the balancers popped out of place. We were quoted a crazy amount for each window. My windows tilt. Balancers are stamped 27B BSI TX or TK. Length is 27? and width is .5?.

We also have 27C BSI TK or TX.
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Casey from SWISCO responded:

Hello,

I believe we can help but it appears that the balance in your photos may be missing a vital part that we would need to see to determine exactly what you need. Please check another balance that I suspect will have a t-lock attachment like the one shown below. 

If you could send us a photo of that part as well and confirm the width, we should be able to point you in the right direction. Thank you!

Dimensions for 15-195
Dimensions for 15-195
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