Can 39-339 work for Jeld Wen casement

A quick learner from Boston, ma says:
Looking to use the 39-339 extension on new Jeld Wen casement windows. Will it fit?
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Dave Sr. from SWISCO responded:
I'm not sure if the 39-339 will work or not. Could you show me a few pictures of the hardware you have now? Can you also provide your measurements? Thanks!
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