If you search my threads I just replaced mine on my 300TE and I have instructions + pictures. It was a nightmare when the tumbler breaks on the inside and you cannot turn the key. Since it still turns, fix it ASAP, seriously.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k