Sorry. I'll try to explain it better. I have 3 levels of service, normal-10 day, rush-5 day, and urgent-3 days. The customer chooses which level they want. I need to implement this using radio buttons as I only want them selecting one option with normal-10 day service as default.

I did manage to get this working to some extent by editing the configuration for this module and adding 3 unique percentage levels. Then I edited the array that creates the check box, changed it to radio buttons and added 2 additional fields in that array for the other 2 buttons. The problem is that regardless of which button is selected, the calculation is based on the final percentage in the array.