The difference between the standard headlight bowl and 3-point headlight bowl are the 3 retaining nuts built into the wing during the moulding process. Providing a more durable anchor for the H4 style headlight unit. This will endure longer than screwing directly into the fibreglass. Making it easier to change the bulb when you need to.
The 3-point headlight bowl upgrade comes with the correct machine screws in either stainless steel or Bright Zinc Plate.