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Bob from SWISCO responded:
June 29, 2023
Hello there. Your casement operator looks like either our 39-253LB & 39-253RB, or the 39-438B & 39-439B. The only difference between these two operator sets is the appendage at the end of the straight arm. The '-253' variety use the square 39-529, whereas the 39-438B and 39-439B use a rectangular piece that comes included. See the video below for more details. I am afraid neither of these operator types come in a stainless variety, though both are coated in an electrostatic powder that make them resistant to corrosion. For covers and handles that work with any of these mechanisms, see the 39-375 and 39-376, or the 39-451 and 39-452, depending on the style you prefer. 
Alternate view and dimensions for 39-239C
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