I'm only familiar with the GM trans but I would look for a kit that has the reusable metal clad/rubber bead gasket. The more expensive kit will also likely have a better quality(less likely to break) plastic for the filter. I wouldn't worry about replacement bolts.

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