If you find yourself in need of the O-rings, and there is no MB dealer handy, or you need them "right now", they are 19mm on the OD and 15mm in the ID.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner