Is it possible to fit the 03 style of light units onto a 96 tdi300 discovery? If so is there much hassle and grief in doing so?

Hi folks, just got myself a T reg Td5 Discovery, well i'll have it as soon as the docs relating to the private plate are through to the garage :mad: was supposed to be today but not to worry! It's an auto box all seems well with the car as a whole but is there anything i should esp watch out...