L322 internal headlight harness

Afternoon people am in need of some info for L322 2008 petrol fitted with xenon adaptive headlights, just been changing a sidelight bulb and found the internal headlamp harness in a right mess, looks like due to heat the wiring insulation has become brittle and detached for the copper cable. Have searched for the harness with no luck and local dealer will only sell me headlight for 1500 quid! Does anyone know if the harness is available separately, breakers here are a minefield and I think anything second hand would have suffered the same fate, any info appreciated TIA.