Missing parts

A home owner from Alaska says:
Purchased a home which was built in 1991. The windows and hardware appear to be original to the home. This window is missing parts for the casement window crank to operate correctly. There are no parts at the top to connect the channel support to and the pieces are missing at the bottom as well. The only marking on the existing bottom hardware reads "Wright 07900."

Any information you can provide me on what pieces I am missing and where to purchase them would be appreciated.
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Tom from SWISCO responded:

Thank you for your patience during this busy season. It sounds like you need a new connecting bracket for the sash. Now, your operator looks like a match for our 39-387, or at least an older version. The problem is that this operator is compatible with maybe a dozen different connecting brackets.

Do you have an identical window in the house that still has that part? If so, we can use that as a reference.

If not, then my best guess would be the 39-546. This is a pretty common sight with the 39-387 but by no means the only one. It's at least a good place to start.

A home owner from Alaska says:
Here are some pictures of another window with the existing hardware. Does this help to narrow down the parts needed?
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Tom from SWISCO responded:

That is a huge help, yes. The bracket on this window does indeed look like an older version of the 39-546. I recommend starting here and seeing what you think.

Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
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