Semco Casement Operator

A quick learner from Sleepy Hollow il says:
How do I identify the part number and how do I measure it. It is a Semco casement window.
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Bob from SWISCO responded:

This looks like possibly the 39-031 and 39-032, which I believe we've seen Semco windows use in the past; but to be safe, I'd consider the 39-155 and 39-156 as well. The only difference between these two sets of operators is the length of the link arm, so carefully compare to see what matches best. 

A quick learner from Sleepy Hollow il says:
What do I measure how do I compare
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Bob from SWISCO responded:

The difference between these two sets of casement operators lies in the length of the link arm. The pictures illustrating these differences are on the shop pages; but for your assistance I have enclosed the pictures below.

For the 39-031 and 39-032, the length of the link arm is 4-7/16" in length. The 39-031 is pictured below.

Dimensions for 39-031
For the 39-155 and 39-156, the link arm is 3-13/16" long. The 39-155 is shown below.
Dimensions for 39-155
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