What do I need to replace my Pan Am Crank

A landlord from Cudjoe Key, FL says:
April 11, 2013
Hello,
I have to replace several dozen cranks, and am unsure which is the correct Pan Am crank.
I've included several photos, if that is of use
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
April 15, 2013
Thanks for posting! It's hard to say without seeing how it connects to the track arm, but check out our 39-017 or maybe our 39-280. Could either of these work for you?
A quick learner from Cudjoe Key, FL says:
April 21, 2013
The 39-017 and 39-016 are very close, with 2 differences:

Mine:
1. Height is 5 one-eighth (39-017 is 5 one-fourth)
2. Connector is 2 one-half (39-017 is 2 three-eighths)

The distance between holes on both top (one-half) and bottom (1 five-sixteenths) is spot on.

The eighth inch top to bottom might be workable, but I'm unsure if changing to a shorter connector will make closing the window more difficult.

Also, I assume they are L and R of the same model, correct
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Tom from SWISCO responded:
April 23, 2013
Thanks for getting back to us. We don't have anything that matches those dimensions exactly, but you may want to check out our 39-011, 39-350, or 39-277. Could you make any of these work?

As for the shorter link arm, it may mean that your windows won't be able to open as far.
Pan Am/Daryl Window Crank
Pan Am/Daryl Window Crank
39-017
$17.98
RH Awning Operator, 3/8" Hole
RH Awning Operator, 3/8" Hole
39-280
$21.70
LH Superior Window Crank
LH Superior Window Crank
39-011
$20.45
Look/Rusco Awning Operator
Look/Rusco Awning Operator
39-350
$19.70
LH Awning Operator, Nu-Aire
LH Awning Operator, Nu-Aire
39-277
$19.70
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