Just because they do not cover it doesnt mean you cant have it on the car..
I called them and asked about a CF bonnet as my GTR bonnet was damaged in a hail storm. They told me I was allowed to put in on the car and there wont be any problems but if I am in an accident or some thing happens to the bonnet they will replace it with a standard bonnet.
So when they say "they dont cover it", they usually mean they will replace with standard if a claim is made.