Well, I happened across my spare tire yesterday which happens to have the Conti-Pro. It's not the same as yours because mine is on a 16" wheel, but it has quite a wide tread and bulge.
I know you were told that these spacers will fit your car, but that is the technical truth and not the applied truth. I'm pretty confident after seeing my spare that you are going to be rolling your front fender, rubbing, or changing your tires to a narrower width. If you go to a narrower tire then you will be able to dial more of the camber out of the rear, but if not then you will have to live with some (though it won't be too bad).
Use an independent shop that you trust-they will be cheaper than the dealership.
Do your drop first and if you have the spacers installed then, then drive carefully until you can figure out where rub occurs. The maneuver that I was talking about was doing a full-lock turn into my driveway at a relatively high speed. Your wheels will be over 2mm farther out, plus tire bulge.
Just use caution and slowly work up your maneuvers to find out where rub occurs. It will occur, you just need to know where in order to figure out how to avoid it.
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