These parts are on Mastic brand vinyl windows
A handy person from Gibbsboro NJ says:
September 3, 2016
Hello.....Can you tell me what part number I will need to replace these spiral balances? They are 5/8 wide by 20" long. The shoe pivot I found on your website....I wasn't sure about the balances because I couldn't find one with a blue tip....Not sure if that even matters...
Tom from SWISCO responded:
September 7, 2016
Hello! If your outer tube is 5/8" in diameter and 20" long, I recommend our S600-20. These have a Blue Tip option.