After finding out the local Ford dealer wants 3+ hours @ $125/hr to install my GT500 diffuser, I've decided to tackle the job myself. The only thing I'm having a hard time with is determining what, if any, additional hardware is needed. Some "kits" I've seen say that hardware is included (but don't say what that hardware is), and none of the instructions or write-ups I've seen seem to mention using it. From what I've been able to see my diffuser already has the 2 white inner clips with it, I believe the next 2 sets out are pins that can be reused from my existing bumper, however I'm starting to think that there may be some hardware required on the very outer edges of the exhaust-bezel parts.