It's crazy how much different the vehicle looks with just the Euro/clear taillights. For example, I've seen a Bullitt in my homeland (Czech Rep) with Euro taillights, doesn't look as good as my US Bullitt.Well, 2 of them, judging by the 'plates.
But, in some colors, like the orange, the clear looks better.
And yes, I know you can swap them out (but only one way, i.e. regulations around the world won't really allow US-style taillights).