The house was built in 1963. The spiral balance diameter is 19" by 9/16" and the plastic tube color is gray. There does not appear to be any color coding for strength of the balances as on your website. The top of the balances were nailed to the inside of the window track and the bottom of the balance has a hinged 2 3/4" metal plate that was nailed to the bottom of the sash.
What spiral balances are the closest replacement?
