Number on rail 33.5 smaller #bs1 inside channel of rail approx 1/2 length 34" without end cap. End 2-3 is 1" long side tabs are approx. 15/16s, end 1-2 is 1 1/2" long - Jim
Will be buying 2 possibly more after to checking other windows
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Bob from SWISCO responded:
January 4, 2022
Thanks for posting. If the metal channel, not including the nylon fittings at either end, is 34" long, then see either our S380-34 or S385-24. The only difference between these two balances is the depth of that bottom nylon shoe, or its 'heel-to-toe' measurement. See the image below for reference and to determine which you might need. In either case, if the stamp on the old balance reads 33-5, then choose a new stamp option of 3350. Let me know if you have any further questions. 
Comparison of the S380 and S385 balance shoes.
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