Stub bracket replacement

A quick learner from North Carolina says:
I just purchased encore dyad still mount operators # 39-220B and 39-2218 which fit fine. I need a stud bracket (photo attached) which screws into the bottom of the window.

I also need the covers and cranks for the still mount operators mentioned above.

I found out they are BF Rich windows.
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Bob from SWISCO responded:

Thanks for posting. Stud Brackets commonly used with the 39-220B and 39-221B include the 39-545 and 39-546. Compare with your old stud brackets, if available, to confirm these match what you have. For covers and handles that work with these operators, see either the 39-375 and 39-376, or the 39-451 and 39-452, depending on the style you prefer. Let me know if you have any questions. 

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