Casement window controller

A handy person from Snowmass Village CO says:
I am told this is a Sierra Pacific window. Left opening. You can see the long arm is approximately 10". Do you carry these? Thank you.
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Lauren from SWISCO responded:

Hello, thank you for posting,

Your operator resembles the 39-253RB that uses the 39-529 track slider. Please review the dimensions to confirm a good fit and let me know if you have any additional questions. 

If a new cover and handle are needed, please review the 39-376 or 39-452 depending on style preference. 

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