You have to drill and add bonnet pins - that's what two of my friends with C-One c/f bonnets (hoods) on their Yarii did (that's the "Echo" version of the Yaris btw).
The first two questions that you have to answer are always "yes, it is real Carbon Fibre" and "No, the bonnet pins aren't fake". Makes a change from "Its a Vehicross..."
A