Gienow Windows

Thanks for writing in. See our S351-26 or S390-26. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2550. 

With your stamping of being "25 5" it would correspond to our stamping of 2550. if you want more of a confirmation that this is the correct stamping for you, you can weigh your sash on a scale and refer to the sash weight chart listed on the product page. That will help you make the decision on which stamping would work best with your sash weight.