Single arm operator to correspond to 39-543

A handy person from kilauea, HI says:
Aloha,
I am looking for the single-arm operator that corresponds to the 39-543 tracks. I need to get multiple tracks, however also need at least several operators. My need for the operators stems from the fact that the "ball" that fits into the plastic socket in the guide tracks have also broken off.

Haven't found the operator in the awning or casement window operator pages nor as a "frequently purchased together" notation.

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Tom from SWISCO responded:

The 39-543 is compatible with a few different operators, which is why we don't have any one type associated. One common sighting is our 39-239B, but I don't know if that's what you have. If possible, I'd like to see a photo of the operator installed on your window now. That will allow me to find something applicable.

A handy person from kilauea, HI says:
Thanks Tom,
I don't have great pictures but here are a few. This is a sill mounted operator for wood-clad Milgard awning windows. Single, stainless arm with a round ball that fits into a corresponding ball "socket" in the 39-543 track.

Please let me know if you can help
Me narrow my search.

Mahalo!
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Tom from SWISCO responded:

Ah, I recognize this part. This is the old Roto straight arm operator. We did sell this for a while, but it was discontinued around last year. To my knowledge, there is no substitute available for it.

I am very sorry for the inconvenience. 

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