Andersen window crank identification

A quick learner from Batavia, Il says:
I need to replace a broken crank. 1361318 is stamped on the 4.5" arm. An R (for right?) is stamped on the arm under the number. From outside the hinges are on the left so in theory I should need a left crank. But when I search for the part number, your site gives me the oposite opener or a right crank (the number and the R match up but the picture is opposite of mine). So you can see I am confused. I could order it completely by matching your picture to my crank. Are your pictures accurate or do I order it by number?
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Donna from SWISCO responded:
It is best to match up to the image online. SWISCO product code 39-146 has 1361316 stamped under the arm and SWISCO product code 39-147 has 1361318 stamped on the top of the arm.
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