the balancer I need is stamped BSI 23B. The length is 23 inches. the depth is 1/2 Inch and width is 1/2 inch I included 3 pictures. One showing the stamped letters and numbers. One of the block and tackle and part that string terminates in that attaches to the channel slide thing which the window sash inserts into. And a picture of the sash balancer overall.
Hopefully you can find a replacement.
Thank you
Sincerely,
John