The washer you can find just about anywhere. A simple copper crush washer should be readily available at your friendly neighborhood Ace or Tru Value.
As for the bolt, I'd imagine the bolt dimensions are detailed in the coolant change portion of the FSM. Unfortunately the maintenance part of the FSM isn't available online right now. You'd have to find someone with an old paper manual or get lucky and find a PDF of it floating around online somewhere.
If you call your dealer and describe the part they can probably order one.
That said I've done this job on numerous cars and never has the bolt looked anything but A-OK. I'm not sure it's something I'd stress about. Just be sure to seat your socket on it well before turning it to avoid rounding it.
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