| Gareth - It's a piece of **** to rewire the licence plate light up into the upper moulded section. You can use one connector from the lower assembly and make up another out of a electrical crimp fitting that holds the other end of the bulb as both original don't fit into the upper moulding.
Be careful with the Casoli / Evolutzione unit as the upper mounting bracket can break. I made one up out of brass and will post a pic soon. Here's a pic from the rear that I took earlier | 
Threaded Mode