yep i did mine and another they cost about ?30 and were modified from the earlier ones to stop interference from transmitters
it is fitted in the middle of the roof, if you have twin sunroofs remove the surrounds that allows you to pull the roof down enough to change it , it only has one plug and 2 screws, if you have no sunroofs like mine its a pig, you are supposed to drop the rooflining, i removed the centre interior light and managed to get my hand in that hole, a few scratches later it was done, i only put one screw back in to hold it up .