From what I see there, it appears the stock retaining spring is replaced by a different spring but you do get to re-use the stock rubber sealing boot. Do I have that about right? If so, I would say Rivco has really thought through this and supplied all the necessary parts to make it work properly. If the claim of 3600 lumens is accurate, light output down-the-road should be more than adequate. Due to the vague cut-off, you may need to lower the beam to keep oncoming traffic from flashing their lights at you.