I have dug around on here and I beleive my question is answered in that I need a "sleeve" to install the D3 in a 2007 VW Passat Wagon. Anyway below is my experience this morning with Crutchfield.
I went online this morning to buy a D3 from Crutchfield and used their fit program and found that the D3 does not fit into my 2007 Passat Wagon. I found this bizarre as a few weeks back the program spit out that it would fit. I also remember on the Pioneer site that it would fit although it looks like Pioneer has taken down their fit chart. I then checked all the VW models on the Crutchfield site and none of them fit. I contacted Crutchfield and they told me that they have done some testing with aftermarket double DINS and found the D3 not to fit. I was told there was no way to secure it without modifying the dash. I did not push them as their response seemed generic. They did not offer any install kits as a remedy. Maybe they gave me that explanation because they are sold out. Who knows but how in the hell is everyone installing theirs? Thanks for any input.