There is usually an oil seal with a retaining ring above it that sits in its own groove, if that retaining ring is in the dust cover groove then the dust covers won’t seat properly.
I now have everything I need to do the swing arm, I am going to have a ring round on Monday and see how quickly I can get it turned around if I want it powder coated.
Got the new swingarm bearings today, also got a full compliment of SKF wheel bearings for the new wheels, I have to say they seem better quality than the KOYO.