Casement window operator replacement

A quick learner from Westmont Illinois says:
Looking to replace multiple casement window operators. The track on the window is from below.
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Dave Sr. from SWISCO responded:

Hello,

Your Biltbest window, along with all of its hardware, has been discontinued and is no longer available. However, take a look at our 39-013 and 39-014 operators, along with the 39-114L handle and 39-533 track. Compare the dimensions of the 39-013 with your existing operator and see if you could possibly retrofit this to work in your window. Please note that you may need to cut your existing sill cover to accept it, or even have a new one fabricated. Review the specifications below and see what you think. Thanks for posting. 

Dimensions for 39-013
Dimensions for 39-013

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