Indeed, it might be too late to make it uniform to the whole site. But if you don't see RHD as something special, the small NA-spec sidemarkers aren't special, too, after all. And aftermarket changes from US cars for EU laws shouldn't get a 'Made for' tag (and EU cars in US, too) but have to be mentioned in comments. A 'Spotted in' tag sounds nice (I noticed in my last series project, when a Nissan Prairie was in East Berlin, of course it's clearly explainable).
Relaxed yes, but not unfounded free setting of such tags.