Photos will follow tomorrow. The ones on the front, that I’m sure I bought as 10mm say 15mm on them.
As to bolt-to-hub versus bolt-through (with extended bolts), I’ve had 2 really bad experiences with the former.
The first was after having the discs skimmed in situ. To cut a long story short, the garage obviously removed the rear spacers to skim the discs and didn’t torque one of them up properly. But the wheel bolts were done up correctly. Result - the wheel came off on the M6!
Second, another garage over tightened the wheel to spacer bolts and stripped the thread (it’s only a shallow thread into aluminium). So I had to have the spacers replaced and, because the bolts that secure the spacer to the hub are recessed, theye were a real PITA to remove.
So, I’m now a bolt-through convert! 
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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