S197 Mustang Headlights
US S197 Mustang headlamps have a flat beam so will pass an SVA test on dip and main beam. In other words, they are not handed for left or right side of the road.
What they don’t have is an integral sidelight, and you need a white sidelight for UK/EU lighting regulations. Your choice here is either to drill and insert a small white LED or 1.5w bulb and holder beside the existing headlamp bulb, or buy a pair of BMW style ‘Angel Eye’ headlamps as pictured below.

ABC design make these and eBay usually yields a set at around £150. The advertisers on this page quite probably stock them as well. The ‘Angel Eye’ is the sidelight in such a unit, and they are UK/EU/SVA compliant.
If you buy a pair of these, you have solved your headlight and sidelight problems all in one go. This is the easy way to do it, and the angel eye looks quite cool after all doesn’t it?
You can drill the hole and insert a small bulb in your US headlamp and make a sidelight if you want to, but it then very often causes misting up of the unit and looks totally naff.
More on sidelights in the sidelight article on this site.
