I have a 2016 vx-line nav ss I have tha standard headlights at the moment I was wondering if I can change them to the xenon headlights if so are the just plug and play or are alterations needed

Does anyone know of anyone selling a xenon drivers side light for a 2009 Insignia

There are usually lots of mods to carry over to a vehicle which was not originally equipped with Xenon.

One of the major components which you may not have on your vehicle is the suspension ride height sensors which will dip the beams when a load is applied to the vehicle.
If these aren't fitted then it may prove more of a task