My right handed Pan Am Window crank looks like the 39-017. The top holes 1/2" apart and bottom holes 1 5/16" are the same as mine. The difference is between the top holes and bottom on the 39-017 are 5 1/4", mine are 5 1/8". The 2 3/8" arm on the 39-017 are 2 9/16" on mine and there are no threads. There is a 3/8"shoulder bolt with 5/16" threads that goes through the arm and screws into the window arm. On one side is the name Pan Am and on the other is a #60. I talked to Steve Friday 2/10 and he said to give you a try. Thank you for your help. If you need additional info, my name is RonnieĀ