Crank and track for casement window operator

A quick learner from Santa Fe New Mexico says:
April 16, 2012
how do I know which crank and track will work with this window operator.

thanks

-aaron
A customer submitted photo of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
April 18, 2012
Thanks for posting, Aaron! This operator actually looks closer to our 39-031, but it's hard to say without knowing the dimensions of the short arm. Take a look and see if you think that might be a good replacement for what you have. You can see the track, cover, handle, sash bracket, and any other additional hardware you might need under the 39-031's Related Parts section.
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