Installed my 25mm H&R wheel spacers today - looks gr8 - was worried about 25mm on front but really improves the stance & looks, arches should be here any day.
The spacers come with studs to fix them to the hub so you can use existing wheel studs to bolt wheel to spacer, my wheel studs where about 1-2 mm to long so had to grind them all down, running 20" 168 reps so just be cautious as you could be up for a new set of studs.

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X5 4.4i 2006 sports package, Titanium silver, Sports exhaust with Xpipe, Limo tint, 20" wheels 168's (Black), 25mm H&R wheel spacers& arch flares all round - Loud........

Work in progress -:
Replace BMW Ipod system with DICE - installed but no sound yet??