The short answer is yes. I have purchased parts from NeedsWings and been happy, but it does pay to shop around. I have found that shipping costs for Needswing parts too costly because of the shipping costs to Canada. I picked up most of my NeedsWings parts from Rob at meets.
Cheaper lenses may be available from a Mercedes dealer as the light unit itself is a standard Mercedes part used on other Mercedes models.
Cheaper yet are LED light units from China.