I have two large Andersen windows. The upper sash is (H) 3 95/8 x 32 3/4. The lower sash is (H)27 x 32 3/4. They are at leasr 26 years old, probably more. I need to replace the balances. They are 6.5 x 3 x 3/4. All the is legible is the No. 11600 on the balance.What do I need?
Thanks, Ron