I will dig today, just need two more measurements
@slcurts just to be sure we match up with what you already have.
The diamter of the crank axle that fits into the crank arm and the overall length end to end of the crank arm.
It may be tough to find an arm with the right ultra-straight line profile but I will look, there were a few companies that used very similar styles albeit they will be different sizes / dimensions so we'll see what we can figure-