Carbon Diamond ?

hi, you remove the original chrome plastic diamond and our carbon badge is bonded/glued to the car in its place, very straight forward and quick to do. I hope this helps, thanks, Chris @ streamline
 
You dont need to gain access to the rear of the bumper, just pull the chrome badge froim the black base plate and glue carbon badge onto the black plastic base. Unless i am getting mixed up with other models, this is as I remember it from the last time I had ours apart and fitted a few customers for them.

You will need to pull the top of bumper out that fixes to slam panel to be able to remove the plastic base plate of course, but this is not necessary when bonding badge to the base plate.