anderson awning window operator

A quick learner from harrisburg, pa says:
part number 1521604, I just ordered from you 1476070 but in doing further research this would be 11 in not 15.
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Bob from SWISCO responded:

I'm afraid I don't really know what part numbers you're talking about. These are often not reliable when choosing replacement hardware, even for a brand name like Andersen. Going by the appearance and dimensions of the old components is always best. Now, you ordered the 39-390. This has arms of 11" in length. There's a long arm version of this operator, the 39-389, which has 15" long arms. Let me know if either of these is what you needed. 

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