Part number is 31265711 on the headlight
Looking at volvobreakers, they suggest 31299619 :
https://www.volvobreakers.co.uk/volv...amp-2007-2013/
and skandix is number 32206139
http://www.skandix.de/en/spare-parts...-tube/1034135/
but Skandix also give this link for Xenon headlights without ABL.
http://www.skandix.de/en/spare-parts...-tube/1023455/
Its all quite confusing! Think I'll stick with the part number on the unit itself