School boy, did your adapters appear to be hub centric? Trying to decide if I should even worry about it and just run these. They've got a set of four on ebay for $109 shipped here:
http://www.ebay.com/itm/4-Wheel-Adap...5f01c0&vxp=mtr
The set that of 2" adapters that Im using on my '92 Camaro with C6 wheels have held up well but dont remember if they are hub centric. Guess I can go pull a wheel.