hey guys i gotta question about the diffs.. (maybe tekno can answer this)

On the build of my diffs i noticed that that washer that goes on top of the outdrive seals was changed at some point.. i have a EB but those ones are Larger and Black in color.
The ones in my ET were a smaller O.D. but a bigger I.D.
the Black ones fit on the outdrives alot better but O.D. To big.
Just does not seem to make sense to me what the Heck do i know.
Just Curious
THANKS

P.S. Just got my Et and build is going great. Once again seems to be ANOTHER Great vechile from TEKNO.
Great job guys!!!!!