I have just put on facelift Headlights from a D2 onto my 300 at the weekend, have had them in my garage for about 6 months deciding whether or not to do it - not because I want to look like a D2, but I like the look of the headlights better.
Not going to bother with the bumpers etc, just like the headlights - and too be honest, you need to be brave with an angle grinder, and be able to improvise on fittings to get them to fit in correctly with the beam pattern etc.....pencil out at least 5 hours if you are going to attempt the conversion.....oh and goof luck