Yes, the 7" bowl is the original Bosch H4 bowl.
This particular D2S projector has a threaded end on it so it fits into the original hole for the H4 bulb. Once installed, the projector sticks out towards the glass lens on the front of the bowl. You still install the D2S bulbs from the rear of the bowl, just like the stock H4 setup.
The shroud is then placed over the projector to cover up its guts ... a nice side effect of this is the cool pattern that is reflected on to the chrome bowl
Of course you can get different shrouds, which will project a different pattern on to the bowl. Different shrouds also have provisions for different diameter CCFL / LED rings, I chose this particular model to fill out the bowl, the CCFL / LED rings are an option that comes with the kit.
The great thing about this kit is it is fully 100% reversible if you needed to convert back
Sandeep