You should be able to find copper crush washers at a general auto parts store, I know Autozone and Napa carry a variety of them.

I read somewhere that if you heated the used copper washer it went back into it's original shape and it could be reused. I should look into that more...

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others