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I just reused the original plugs with no problem. Mine used silver colored o rings and came right out without issue. I was the first one in there to change the diff fluid so no butchery of the plugs.
Hey, I'm about to change my differential gear oil on my CTT. I don't see spending $15 x 4 on new plugs. Maybe I'll get one as a spare in case I chew up the hex. What crush washers did you use? Thanks!