The old balancer has "29B" and "USB" stamped on it. The aluminum is 30" long and 1/2" wide. Which SWISCO part do you recommend?
Tom from SWISCO responded:
April 24, 2017
Thank you for contacting us. We believe you have a Pan Am window that may use our S377-30 channel balance with the 2920 weight option. Please take a look and let us know if you agree.