Spoiler: 3piece vs 5 piece

[Lhorn]

What's the difference between the two? Were both available on the GN?

 

[zam70]

3 piece is the spoiler only
5 piece is the spoiler & the 1/4 extensions that are drilled & filled for the spoiler.

Basically, they are the same thing. The 1/4 extensions for the spoiler are filled on the inside and then drilled for the 1/4 pieces of the spoiler. You can make non spoiler 1/4 extensions work. You just have to fill and drill them your self.