not sure what brand crank, this is, but it is similiar to your 39-016 pan american?
A quick learner from 96817 says:
October 17, 2018
is this the pan american
Tom from SWISCO responded:
October 26, 2018
I agree, our 39-016 was my first thought, as well. The only detail I'm not 100% sure about is the size of the hole on the arm. Ours is a 5/16" threaded hole. Would this work for you?