Tool is BMW p/n 83300491781. It contains parts to do 2 sizes of seals, I believe the ZX trans for the V-8's(smaller seal) and the GM trans for the inline 6's. It works well but requires some patience to use, especially the first time.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)