Tires were mounted before they shipped to my house(from the TireRack.com).
Bolts came with the wheels. I checked the invoice but it doesn't list the part number for the bolts. They are the cone seat type.
OZ should have ball seat bolts. I have them.
Also suggest having them balanced at a good shop.
Tirerack also mounted and balanced my OZ Leggera's and tires, but my VW dealer found 2 of the 4 off. I did not feel before but after adjusting I could tell better. I have found my VW dealer is best so far at balancing
Also see if they install the best balanced tire by driver, front left and worst balanced in right rear. Wheels look good.
What tires did you get? Maybe I missed in notes.