A quick learner from USA says:
May 18, 2016
Tom from SWISCO responded:
May 20, 2016
That part does look an awful lot like our 55-063. You said it doesn't look the same, though. Can you elaborate why you think so?
Is your window tilt or non-tilt? If it's tilt, and if the balance has a 5/8" diameter outer tube, then the Series 600 is a good match. This can be installed and charged with our 75-006.