I ordered this:
Maxim Dyad Sill Mount Operator, RH
39-221 Unfortunately, this doesn't look like it is going to work. There looks to be a couple of issues:
It's right handed, not left
It has one extender bar not two (see photo)
It's brown, if white is available that would match my window
The gear teeth appear to be plastic, are there some that are made with metal?
It did seems to fit otherwise, the wholes matched up and the latch fit in the window opening.
I attached a few pictures.
Thank you for your advice to order the correct part.