I installed 12mm/15mm spacers and 82mm studs.
Spacers help fill in the wheel well and there are no vibrations.
The studs come with 5mm allen bullet tips for easy intallation - Torq'd 16 ft/lbs with red loctite and nuts were Torq'd to 86 ft/lbs
The 82mm studs were perfect as they allow up to 20mm spacers and they don't stick out too much.
The studs were from Motorsport Hardware
Very good deal on studs kits.
Here are some photos.