The o-ring and copperseal is cheap and numbers for them are in another recent topic.

The real hassle is you have to remove the intake to gain access to the holders unless it is the 2 in front that leak.

Then you have to find the special 32spline socket, other than that there's nothing special about it really, keep it clean though.
I usually tourqe them down with less tourqe then required first and then loosen them a bit and then finalizing it.

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/Per

MB E300TDT -98