Is it a BMW tool? I tried a "similar" Harbor Freight tool that didn't work. I know there is a specific rear ball joint tool for the E39, but I don't remember the front being specific or not.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim