Hi Firestarter.
I guess the critical hub measurement is from centre of hub nut/driveshaft end upto hub clamping bolt centre.
You could put a ruler up against the hub face, straight up and then use anything with a 90 degree angle back in to bolt centre line to get a measurement.
Don't know if disc will get in the way.You may have to take it off.
If that size is ok then difference must be on the strut somewhere.
Measure from centre of clamp bolt to bottom of spring saddle. That must be where the difference is.
Don't know how accurately they weld spring saddle to strut and between that and a few mm difference on hole position for clamp bolt, this could make up your 12mm.
What was the ride height from ground to wheel arch with it on it's wheels on flat ground. That should only be 12mm difference as well.
dave
February 2011