They get far too many requests for custom work from people in high school, prison, etc. who will never buy anything.
Call them up, and they'll tell you where to find a piston submission form on-line, or mail you one.
Remember: you become the general contractor, and the piston will be no better than the dimensions and instructions you give them. You don't get free engineering with a custom piston.
If you get the compression distance, ring stack, valve notch position, angle and depth, compression dome, pin size, etc. wrong you eat it.
