Yes, they're supposed to be two different sizes, also yes most folks (even those who can't properly adjust wheel bearings) use two of the same, I try hard to be a better Mechanic than that so I'll see what transpires ~ I spotted a red synthetic O-Ring assortment the other day and will see the next time I do an oil change if it's the correct ones or not .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better