window operator part needed

A home owner says:
i'm trying to find the replacement part for the following window operator. I wrote down all the part #'s i could find.

DEL MAR HARDWARE 30894 PAT.CANADA 1986 PAT.2135397

User submitted a photo of a window crank.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! I think this operator could be either our 39-090 or our 39-188, however the defining factor between the two is hidden in your picture. Which of these is closer? If you can't tell, can you show me the full arm? That will allow me to decide. Thanks!
A home owner says:
will this picture help
User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
The arm is still partially obscured, so it's hard to say, but I think that our 39-188 & 39-197 could be a good match. Again, it's hard to tell, but take a look at those and let me know if you agree.
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