Holy crap this confused me!
+1
What's the front speaker size on the gen2? 6"?
Correct
Are shallow speakers readily available for these or will you need to do some sort of spacer such as Morgrans?
All speakers will need some sort of spacer/bracket as the stock one is inbuilt to the speaker.
It's impossible to simply shove the speaker in the hole and drive away. Holes don't line up for the screws to work unfortunately.