One thing that I always seem to have a problem with when I have these cars or the Spitfire , is the bad connection for the light bulbs. No matter how meticuously I cleaned the lamp holders , there was always a bad connection and failure of the lights to work consistently. It took me a while to find an alternative. I was looking for a sealed unit that included fog and reversing lamps. I also wanted something that echoed the curves of the body and not square or completley circular. I found at last a DAF Truck combination lamp. Involved a bit of cutting to the rear bodywork but nothing too drastic if I ever want to reinstate the original units. The attached photo shows them on the car before the re spray. I think I got the balance right.