Hi guys, first post here.

I've been searching and reading as much as I can, but still have a few questions about replacing the original double DIN head unit in my 1997 KF Verada with a cheap JVC single DIN unit.

I've ordered a JVC KD-X330BT head unit.
I've ordered a JVC KD-X330BT>ISO harness.
I've ordered an APP0111 Mitsubishi>ISO harness (correct I hope?!)
All are in the process of being delivered.

Q1. Do I need anything else?
Q2. Will the JVC head unit mount into the factory double DIN cage without any extra hardware?
Q3. Can I buy *any* single DIN pocket/drawer to fill the vacant DIN space, or do I need a specific one?
Q4. I've noticed that the factory head unit has the main plug and aerial, but also a third plug/cable.
What is it (see photo below)?




This is the original head unit.