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That's odd. I'd give them a call to see which one they actually have if you do want to replace the wedge ones, just to be sure you don't wind up getting the same thing.MGW shows the flat plate in their main exploded parts view, but when you click on the item it's shown as the wedge-shaped plate.
As a side note, try not to run ammo that is at or exceeds SAAMI COAL as the front to back of the FNP mags is right at SAAMI specs. That can also cause binding in the mags.