x2,
personaly, i would measure legnth. Match it up to your celi, and decide how much fab / cut will be required.
If you are not personally familiar with fiberglass work, then i would recommend against it, however i would like to buy the parts in that instance

Otherwise, if you have DEEP pockets, then take it to a custom's shop, but they will not be forgiving on your bank account. (I never was

)