Old trick for solid copper washers (NOT the composite crush type) commonly used for oil seal, if they are in good shape, not scored or over tightened to distortion: Put it on a flat surface solid enough to take heat without warping, put it in the oven (when other half not watching), set for 150 to 200 degrees (F), when the oven comes up to temp, turn it off a let it cool, and reuse.
It works, but is usually reserved for weekends after the parts place has closed, or the sizes you just can't find.

__________________
1984 300 D runs, interior
1984 300 D light hit in front, RUST, mint/perfect dash, decent interior (see above), parts car
(hate to kill one)
1998 Dodge diesel