I use small screws to atttach the flares on my X5. I know mrbmwx5 did the same thing. His flares was on for years with many miles and no issue at all. Stock mounting clips do come off, ask Big"J" how he lost his.

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)