Here is another picture of the pin for the centre stand spring:
This was taken from the left side of the motorcycle just behind the kickstart lever shaft.
Here are some dimensions:
The pin major diameter is 10
The pin total length is 50
The area which receives the springs is diameter 7.6 by 15 long
The distance from the left end of the pin to the stepped down diameter for the springs is 4
The pin extends from the left side of the frame tube by 27.5
The bottom of the pin major diameter is 75 above the front edge of the bottom of the frame tube