PSS9 Questions - missing a part

[MattMarks]

Hi all - I bought a used set of Pss9s for my 986 and I am not sure if I am missing a part. It was not immediately apparent if I was missing the small washer in the first diagram from Bilstein, or if in fact that was part #2 in the Porsche PET diagram on the bottom

Are they the same part and just get re-used? If not and I am missing a part, anyone have a set that are currently dis-assembled and could get me the ID, OD, and thickness? It will take a month for Bilstein to figure it out and locate the part, whereas I can have it turned in 15 minutes at my local wrench...

Bilstein Diagram





Thanks!