Lemming - I don't know if this will help you with anything or not... I hope some more experienced guys chime in.
Attached is a pic of my wheel, installed. You can see the axle end, snail adjuster, swing arm plate, black spacer, and small "silver" spacer, which has a flange (and which isn't shown in my B5 parts diagram at all). Those two metal spacers are the only parts that come off when I remove the wheel - the black rubber seal stays in the hub, and I have never seen the larger, thin ring you show in your second pic.
In your first pic, the rubber seal on the hub looks rather chowdered up - I wonder, is it damaged, and that metal ring in the second pic is part of that seal?