Anderson roto window replacement part needed

A home owner from Philadelphia 1936 says:

I am in need of two of these for my bow window. How can I get this part and replace on my Anderson Bow window

Need to get this replacement for my front bow window For both operating windows. How can I get this exact part to replace so the windows open and operate. Thank you!

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Bob from SWISCO responded:

This looks a bit like an old version of the 39-329 and 39-232. Carefully compare the dimensions with your old hardware, and see if you think this could work for you. 

A home owner from Philadelphia 19136 says:
Thank you Bob, I will check this today. Again thank you for your response and assistance.
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