Wow!
NiclasB & Teddy - you are both *very* much overly-modest.
Teddy - your best match may be to 2/3 outboard (& NiclasB's efforts appear to replicate or at least also feature this), but Nic's near-fuselage overlay does not include the circular feature seen in the other 2 suggested locations.
This circular feature is absent in photos of the debris.
If this is the case, the forces involved in detaching the HS component from the airframe must have been sufficient to do so at the structure's strongest point - where it attaches to the fuselage (or spar-like through-tail structure).
(Ducking in advance of accusations of being an 'armchair expert'!)
Dean