to get the bonnet release off, first unhook the wire on the hood end, then pull the release as far as it will go, then on the bottom of the lever at the center there is a black plastic piece which you have to push someway and eventually you can pull the black piece out and the the handle slides off.
btw Phil, are you sticking this in a
Ibiza or Leon? I had my MDF rings at 32mm and the speakers hit the door card. Had to make them about 25mm I think so it would clear enough.
Also, there is a small plastic stub on the upper back corner by the speaker grill on the door card which I had to cut off because it pushed right onto the mdf rings so the door card wouldn't fit.
I'll try to remember to take some pics tomorrow since I have the door card and speaker off at the moment....One of my speakers is ripped