What is the difference between 39-089 and the 39-187?

A quick learner from Cupertino CA says:
What is the difference between Dyad Operator #39-089 & #39-187 ?

These are the proper operators for my exisitng windows. I am looking for a high quality version for a salty beachfront environment. Ideally stainless steel.

thank you rick s
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Mike from SWISCO responded:
They both are very similar operators. The only difference is the zig zag arm that connections the 5" arm to the operator. The 39-089 has a longer zig zag arm than the 39-187. It is easier to see the zig zag arm by viewing the operator from the back. Here are images of the back view of both operators.
View of the back of the 39-089 crank operator.
View of the back of the 39-187 operator.
PS: I also just found this similar discussion regarding the right handed version of these operators.
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