Need to replace this Roto part and handle

A quick learner from Orem, UT says:
The plastic cover says 'roto'. This is from a window that was installed in 1995.
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Casey from SWISCO responded:

Hello, 

Unfortunately, Roto has been slowly discontinuing most of its window hardware over the past few years. The only part that we can still supply would be the 39-248 operator base. I'm sorry that we couldn't be more help with this repair. Please let us know if you have any other questions. 

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