The $1800 you pay for comes as a complete light kit AND comes with warranty via bmw and nothing will fall apart. Just so you know, e90 headlights are fragile, some people have had to replace/repair theirs because they break/crack without any type of accidents.
I'm sure your parts are under a 10-30 day warranty?
Good find though.
Hope this helps you with parts: http://parts.bmwofsouthatlanta.com/p...85&searchTerm=
You also might want to adjust your attitude, no one is 'hating' because you got a good deal.