Truth split arm operator

A home owner from peterborough, Ontario says:
i was wondering if you could help me identify this part. It's very hard to see, but it is made by Truth and has an arm length of 5". It does not have a stabilizing tab.
User submitted photo of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! Check out our 39-187 operator, this appears to match what you show. You would need to install it with #8-32 x 3/4" stainless steel pan head phillips screws.
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