You could check the thread that I posted on my snap-in adapter installation

Sounds like you still need to get the eject box support frame too. I had a really hard time getting this all installed (and ended up with an imperfect solution).

I wouldn't do it again -- especially because my iPhone 3G appears to provide better reception than the Motorola RAZR. I obviously can't be sure that the iPhone is better -- the signal seems to be; I have fewer dropped calls and it shows more bars than the RAZR.