Window operator for crestline window

A quick learner from 58401 says:
Entry guard window operator for crestline window numbers included are 20810 on the straight arm on the curved arm it's 30841L appears to be the operating arm is about 9 in long
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Casey from SWISCO responded:

Hello,

Your photos resemble the EntryGard 39-031 operator. We also offer the 39-032 opposite-handed version. The determining factor would be the length of the shorter link arm compared to the image below. Both parts are used with the 39-107FK handle and cover kit and the 39-505 track for the straight arm. Take a look and let us know if you have any other questions. 

Dimensions for 39-031
Dimensions for 39-031

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