Note that the rivets that hold the fender liner on are plastic and require a proper type riveter. I'd think a standard pop rivet gun could work but I couldn't get mine to. I used Vise Grips and a screwdriver to fit mine. Might be able to replace the plastic ones with standard pop rivets. Good news is the OE plastic ones are super cheap even from the dealer. I got a couple of the others fasteners that hold the liner on at the same time.

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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