I need to replace the Window Balances for my windows and I'm having a hard time finding the right size and the right bottom fitting that was put on the balances that I have. The actual balance measures just above 30 1/2 inches and the numbers stamped on the balance is 30 3. I can't find the maker of the window but I included a pic of a sticker I found on the window. Hopefully the pic of the sticker will help. Models 351 and 390 are very close but the bottom attachment doesn't match mine. I appreciate your help very much!! I look forward to hearing from you.
Sincerely,
Manuel