Single Arm crank operators

A home owner from USA says:
I have the same model as the 39-138 and 39-139 but the arm is 1.5" longer (11") instead of 9.5". Do you have the longer or does it really matter?

Does the 391xx come in different colors or just the white?

Profile picture of Paul
Paul from SWISCO responded:
Sure, look at our 39-141 and 39-142. These have 11" arms.
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