We have these lasercut and then dull nickel plated washers with wide face for spreading load on Norton rear wheel spindles. These were originally fitted to Norton single rear wheels but are nearly always missing when restoring a bike
Like most special Norton fastenings they are not commercially available in the original size - hence why we had them made.
As you can see from the photos, they are approx 1.9mm thick and help spread the load on tightening the rear wheel - original washers often get 'belled' from frequently doing this.
Price is for a pair of washers