No need to order some regular old lock washers online from Mcmaster... just run down to your local auto parts store and buy them. If they don't have them listed for metric then get the standard equivalent size.

I also use anti-seize on all turbo system fasteners, ALWAYS. You can also get this shit at the parts store. I like the nickel stuff myself, but any type you get will work just fine. The copper will conduct electricity, for battery terminals and so forth. You can even pick up a small packet for spark plugs at the checkout lane for about a buck.

Anti-seize does not just burn off, that's ridiculous. Haha! Hell, the nickel shit that I'm using is rated to 2600 degrees! Now, the grease that makes up the base will smoke at first for a few minutes and eventually burn away... but the graphite, aluminum and nickel will remain on the threads and serve it's purpose.