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The ISF headlights are the same as the 2IS. I'm not sure if the US spec is compatible, you might be able to use it. However, being that you're in the UK, the projector cutoff step is reversed.
You will need to find a right hand drive set if you want the cutoff to be proper for UK roads. Other than that, all ISx headlights are the same. ISF uses differnt plastic brackets they bolts onto the bottom of the headlights for our F bumper