Does anyone know where I can get my hands on a rear diff oil seal for the left side half shaft? I suppose I should mention that it's an 89 Audi 90 Q. I can find the right side one no problem, maybe because it is smaller, however no one has a part listed for the left side. Not Napa, O'Reilly, Auto Zone, Ebay... not even Rock Auto! Failing anyone knowing where I can get the seal, does anyone know it's exact inside and outside diameter? Measuring it without pulling it isn't going to happen, and I sure as hell don't want to pull it without a replacement in hand.