The two black clips are indeed those that clip into the glass (there is a holding "nut" and screw). The white clip is simply a different version of the same part - but for the rear door window(s). The black (longer) are for the front windows (two per window). BMW lists (presently) a different part for the rear doors - I can't recall the part number - it's towards $9 US. My dealer gave me an orange color one (E46 or later car) which is a bit shorter. It works fine and was less money. The black are NOW listed for the rear doors in the BMW ETK software that dealers use (same as realoem.com).

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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.