Maybe you need bolts that have a 14mm OD at the top portion that goes through the hole in the rim, but has the 12mm thread on the bottom part that threads into the hub. Maybe a wheel specialist can advise where you can get those or if they are even required. You might try calling the Tire Rack people who are a sponsor of the site.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra