I can tell you from experience, that the Chinese ones are not plug and play. I just got my car back from being fixed in an accident and Progressive ordered Chinese headlights... Its a new gen headlight so I'm excited to show them off when they are wired correctly, but it appears that the headlight bulb is the world H4 vrs our H13 (easy fix with an H13 to H4 connector off ebay) But the turn signal and parking lights are separately wired so I'll have to rewire. Luckily they gave me back my smashed aftermarket headlight so I intend to cut the wires and reuse the connectors. Go Progressive!!!