Installing the AAS Kit

[Psyfox]

Alright guys, so me and a buddy are literally installing the front and rear bumpers ourselves right now and we ran into a problem... We got the bumpers off ok, but on the rear bumper (at least for now), the foam on the inside of the bumper is causing it not to fit onto the car at all. Has anyone run into this problem before? Should I just shave down the foam? What do you guys suggest? Also, am I going to run into this problem on the front as well?..and if so what should I do for that one?

If I can get an answer soon that would be awesome, seeing that we're doing it right now, lol. Thanks guys.