You can tell if your door inserts are original by looking closely at the metal backing plates.
The factory ones were made in a stamping press with a dedicated die. This produces a continuous 90° bend all the way around the upper corners.
This is a compound curve that can not be formed when cut and formed on a sheet metal brake like the aftermarket were. The one formed on a brake have 90° flanges on the straight sections, but not in the corners.
Nice, got it! If I ever have the inserts off again, I'll definitely check for that and report back. I just went out and looked....there's no way to see up behind there without removing them unfortunately.