Michael,
I am replying to your thread to keep the info together and keep the information public.
I believe you want to contact a Bosch certified injection shop, or any shop that has a strong alliance with Bosch. As long as you have the number from the side of your pump, they can get you any part you need. I would not waste my time with the dealer, they are more interested in newer cars.
I have some used spares that I can measure for you with vernier calipers, but the measurements will be slightly off b/c of the deformation issue- Still good numbers though.

If you really have ZERO luck getting a new washer... you can reform your current one. (I know... I know...) Place it b/w two strong, flat surfaces and beat them flat with a hammer. Then polish your washer with light sandpaper, finishing with steel wool. If the copper appears to be completely removed, you should definitely find a new washer somehow b/c of the corrosion issues involved.

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