Umm. Diablo doesn't make a bolt on for Crossfires. They are weld ons. Look on Diablo's site, they only offer bolt ons for like 2 cars (Corvettes). http://www.gtfactory.jp/diablo.htm

Here's a link ot the official GT Factory maker of Diablo's. That link will take you to the diablo model, then you can click on bolt on up top and see they don't offer it for Crossfire.
http://www.gtfactory.jp/bolton.htm

Dont be fooled, they will be weld-on, and alot of people say they aren't as good. Also I hope they do a good job re-painting the area where they have to grind down to bare metal to weld.

Also if you are sure you want Diablo's. Don't buy from their manufacturers site, they sell for $999 on there. But i found this site with $100 off.
http://www.aerokits.net/DiabloHinge/gtf.htm