Truth entry guard casement operator

A handy person from Dearborn Heights Michigan says:
45273 crank mechanism, L31539 short curved arm about 3 1/4 inches, 20748 connecting arm about 3 inches, bar on sash is 11 3/8 inches, stainless guide is about 10 inches.Main arm is about 9 1/2 inches long.
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A handy person from Dearborn Heights Michigan says:
Which replacement operator will work for this. 20 + yr. old Marvin casement window.
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Tom from SWISCO responded:

We don't have an operator that has the same sized link arm as your original. The best options we have are the 39-155 and 39-156, which have a 3-15/16" long link arm, and then the 39-333 and 39-334, which have a 2-15/16" long link arm. Neither are the same, but we have nothing better. Could you get either of these pairs to work for your window?

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