According to a competitor of PP, the crush washer is part 007603-012102. It costs only $.25, so buy one via PP when you order the pressure sender.

Yes, in my opinion, you want to use a new crush washer to ensure no oil leaks.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).