Window sash won't stay open

A home owner from Oak park illinois says:
Says 8254 on the specific part. I need replacement pieces so that the actual sash will stay open and stay in the frame track.
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Casey from SWISCO responded:

Hello,

Take a look and compare the dimensions of our 26-377 pivot bar to yours, which has the same 8254 stamp code. 

If your window won't stay open, you may need new balances. We would need to see those parts removed from the window as well to identify repalcements. Thanks for posting! 

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