Window does not close completely

A home owner from MT says:
Clogged gear wheels worn and do not engage enough to allow window closure and locking. House was built in 1995 and I assume these are originals. I'd like to purchase three replacements.
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Tom from SWISCO responded:

I'm very confident that we have operators that will replace what you have now, but your photos only show the base. We will need to see the rest of the mechanism, which is currently obscured by the window frame. Please show me a picture of the rest of the operator and I will do my best to find a match.

A home owner from MT says:
You requested more photos, attached:
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Tom from SWISCO responded:

Thanks! Start by looking at our 39-031 and 39-032. I think these may be the operators you're looking for, but review our dimensions just to make sure everything lines up.

A home owner from MT says:
I'm assuming determination of right or left is looking out the window from the inside? In the photo I am looking out and the bad one is on the right side window. What is the part number for this one again?
Thanks,
LG
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Bob from SWISCO responded:

With this particular set of operators, the side of the base on which the gears are concentrated and from which the arms connect to are most important for orientation. Seems to me you need the 39-031

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