Ron is correct- I looked into this when I had to replace the same panel on my truck.
Once challenge you will have (if you are a perfectionist) is that there in no real way to spot weld the replacement panel in the same locations as the factory so it will be apparent the panel was replaced. You could, as I did, replace the entire left rear body section (including wheel well) so this is not a problem. Or you can have a talented body guy 'fake' the spot welds which can be done but will take some time.
All the best with your project,
Proud restorer and former owner of '94 NAS D90 #590- back in the hands of its original owners.
And now happy owner of a 1988 Swiss-Market D90 Station Wagon.