The only thing I can think of if the pieces are gone is to remove it and try to cut some out of cardboard or sturdy paper to use as a pattern. Then possibly go to a good hobby shop (RC cars, airplanes, boats, etc...) and ask them the best way to fix it.
With the cost of some of those "toys" I'd think they get damaged and they have a solution to fixing them. Since it's plastic, they very well may have a solution.
I'm interested in seeing what they might have to say.
(ramfam...I think I'd prefer a cup holder with a lower center of gravity...driving the Manual Trans and morning coffee is always an interesting en devour)