I have a lower window an S751 ribbed channel balance that has a mark 36RB on it. It is 38 3/4 inches long and the window is 25.4 lbs. The upper window is 41 1/2 glass is 37 1/2 and the lower window is 29" glass is 25".
I am trying to figure out the correct part to order. Since it is stamped 36 it should be 37 but is 38 3/4.
The upper window balance is stamped 34TG and is 33" long that one I installed and is correct.
I am also looking for a replacement pivot point see picture above.
Thanks
Jim