I have this number on my cranks - Made by TRUTH 45136
So far the only thing I have found here is the 39-255. I also need the 13.5 arm. The other one that was reference didn't have the same screw holes.
Thank you
Paul from SWISCO responded:
June 19, 2017
If your arm is 13.5" long, see our 39-013 and 39-014. These could be what you're looking for.