25" length, channel is 1/2" stamped with 2410. Top plastic part broke has 6603 stamped on it (I had another one break). Windows were installed in 1980.
Paul from SWISCO responded:
July 27, 2018
Hello,
It looks like the balance you need is our S370-25 with a spring weight of 2410. Let us know if you have any other questions. Thank you!