Hi folks, I`m struggling to find any part numbers or info regarding the rubber grommet usually fitted in the rear of the headlight bowl to stop the ingress of water and prevent chaffing of the wires. I have bought a later model headlight unit complete except for this grommet. Any help in finding one would be much appreciated, thanks in advance. p.s its a rectangular hole in the back of the new H/light. Cheers regards Richard.