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Finally got my new Packard on the lift and it's leaking oil from the drain plug. I need to start with fresh fluids anyway but can't find the part for the plug and gasket. Prefer to change it out. Thanks

Here is factory info on the drain plug. You can probably find one with the proper thread as an aftermarket plug at the auto parts store.

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Usually, just replacing the washer will seal the deal.

The original gasket was copper but as I recall, back in the day auto parts places often sold a nylon washer to take the place of the original. If you replace the plug or just get a new or different type washer, make sure the sealing surface on the pan is smooth and flat. Unless the pan surface is free of burrs and gouges any new washer won't seal much better than the old washer or plug.