Which pella hinge?

A quick learner from USA says:
can I get your help so I can order the correct window hinge. I measured the long arm and it is (11 and 5/8) from end to end. You can respond via email I've attached some photos below.
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Bob from SWISCO responded:

Take a look at our 39-396 an 39-397 12-1/8" Hinge Arm Assemblies; these are the closest matches we could find. Look them over and see if you think you could use these as substitutes. 

39-396 : LH 12-1/8
LH 12-1/8" Hinge Arm Assembly, Pella
39-397 : RH 12-1/8
RH 12-1/8" Hinge Arm Assembly, Pella
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