well i can add some info i found out while building mine
You can easely fit 6.5" in the front doors with a small mdf wood spacer.
and in the rear you can fit 6.5" in the original "mounts"
and i would realy recomend to sounddampen the roof and boot lid on the inside as this makes a massive diffrense!
hope this helps somebody and if you have a question feel free to pm me and
i will reply if i know the answer