So, you've decided to pull off your factory wheels from your RX-8 because the aftermarket wheels have grabbed your attention and your pocket book as well.
Now you would love to sell your original wheels to just about any one that would flash a two dollar bill but not yet ready to give them away for peanuts... Here is a web site that will get you the info on cars that your unwanted wheels will fit and possibly help get rid of the wheels you no longer want taking up valueble space around the house......
18x8 wheels bolt pattern 5x114.3/4-1/2" If I'm correct the 5x115 bolt pattern will also work, seeing that the 12mm bolts are undersized to the tapped holes of the original wheels,right? If this is true then a wide range of cars and vans will except the factory wheels...I'm sure that these wheels would look nice on any application, especially an older one...........Let me know if I.m wrong on this ;) http://www.wheelaccessory.com/application-page.html

Also take into account center bore and offset.

Your right, centerbore alone "will" elimanate many of the domestic cars from using RX8 wheels. I didn't look at that closely, thanks. Now if only I had a machine shop :( Measuring the Mazda bore shows to be 67.2 Offset can present another problem......spacers? ..........anyway, good point.