I know this is one of those trivial type details. But to me it makes a big difference aesthetically. I REALLY like the look of the pre-facelift lights. Go ahead, flame all you want, but there is a certain degree of aggressiveness and clean retro style that the '00 pre-facelift lights have that the later model halo's can't duplicate.
That being said, I've already upgraded my lenses to replicate the "euro" look with clear corners:
See attached
While I love the no-amber look, I've seen a few '00 model M5's with the facelifted headlight lense only, without upgraded angel eyes: See attached(not my car)
This is the look that, IMO, gives the best of both worlds. I like the newer looking round turn signal that is incorporated into the headlight assembly while keeping the pre-facelift headlights. I've searched everywhere and can't find them. Someone here HAS to have a source for them? TIA!