He will ship it to you split. brace to re attach works well , I used 2 stainless rods, which i encased in an expoxy bath, using bluetac to create the walls, so it could dry.
I mounted the two sides separately first, as it turns out, I needed about a 3mm gap in between the 2 pieces, to make it fit better.
Needed about a day of patient work, sanded the lip that attaches to the valance underneath, to match (some variation there), and sanded one side of the spoiler, toward the top corner , to get it to sit better etc etc.
So definitely some fine tuning needed, but all hand sanding, nothing major.
Heavy construction, thick glass all around, hard to avoid minor gaps around the valance, as it goes up around the corners, but this it not unlike original, or csl spoiler.
I have used a thin rubber, to fill those gaps, but may still remove it, as gaps are vv minor.
