I need to replace the adapter plug on one of my CDIs. In watching a video of how to do it, I noticed that not only are there two o-rings on the adapter plug, but there's a red o-ring on the end of the wiring harness. I would assume it would be a good idea to replace this...but there is no MB part number for it and, according to the MB parts department, there's no need to replace it. But it just seems like, as long as I'm going to the effort, why not just replace it?

Thoughts?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Some thoughts:
Take the O-ring off and get a measurement and shop with that.

Buy a metric O-ring assortment that has what you think the size is in the kit.

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84 300D, 82 Volvo 244Gl Diesel