Great thing about all the Australian LC100s - no integrated nav. Even the top of the range
Sahara had a wide double din system that was only sound and navigation.
@Ghillie - first thing we need to know is "what do you have in there now". Looking at your truck, I'm 90% certain it will be a "wide" (200mm v 178mm) double din CD radio with Bluetooth - so your aftermarket options are wide open.
My upgrade path with my 2007 GXL was:
- Head Unit - DIY 1: I installed an Atoto A6 Pro, and if you're happy to DIY, it's an excellent option. Heaps of "how tos" here on the 'mud on head unit changes.
- Head Unit - DIY 2: The T'eyes CC3 is an excellent option, @Red Beard the Aussie LCs don't have an amp so no hum issues

- Head Unit - simple installer: You've got an Autobarn on Kessels Road, you can pretty well choose any of the double din head units in there. I would pay a bit more for one with wireless Android Auto and/or wireless Apple Carplay - trust me once you've cable-free you won't want to go back
- Head Unit - pro job: Drivesound Moorooka - you'll pay however you'll get good advice and a top quality installation
- Adapters - standard double DIN is 178mm wide, so you'll need some "ears" either side of the head unit - Aerpro has what you need for this, speaker spacers, and wiring harnesses.
- Front speakers - you have some really - really - cheap 6.5" dual cone speakers in yours, I would add a good 6.5" component set (here's one) which will make a huge difference. To get the tweeter up the top of the door, you will see a blank triangle where the Sahara and LX470 have a tweeter. You'll need this trim part (LHS) and this trim part (RHS) - you'll have to find a way to secure the tweeter - I used double sided tape and hot glue, as I couldn't get the tweeter mounting bracket online. If you have time, put some Dynamat or Pingjing in the doors, even a small 60cm x 60cm panel will make a HUGE difference to sound quality.
- Amp and rear fill and maybe sub - a good compact 5 channel amp will fit under the passenger seat, I added some nice 6.5" coaxials for rear fill, and you could add an underseat sub or install a sub box in the back.
Heres's a T'eyes CC3 screenshot from my
LX470. (I no longer have the GXL LC100 due to major error on the Tele Track - problem was between the seat and steering wheel

)
Oh and a final hint - the
Oricom 300 UHF fits perfectly where the ashtray is: