Hi guys, has anyone tried to fit xenon headlight bulbs to a 172 (or any other car)?? Any comments about them, are they reliable, are they really as good as originally fitted xenons in MK2 172, or a BMW etc., any problems they cause? I dont know the bulb type in my car (MK1 172) is it H4?? I found some for 7 to 9 quid in e-bay, do you think these prices are ok?? Any comments and advice welcome