Is there a decent Mad Rat motor protector out there?

[damselfly]

I was out with my Mad Rat this evening and hit a bump which resulted in my car doing a wheelie, ripping the wing off, and shearing a small amount of a terminal of my motor.
Fortunately the motor is still OK.

On this note, does anybody know of a larger motor protector or even a rear bumper that'll suffice to actually protect the back end? Failing this, can anybody suggest an alternative?

Cheers.