hey mate, you can buy an antenna from repco (7.5dB) for $69 which I thought was damn reasonable. the roof racks you can buy from here:
Heavy Duty RLTP Roof Rack | Rhino-Rack
immobiliser im not so sure, try ebay.
as for lighting, I have these in the rear lights for boot, best and cheapest mod by far for camping mate.
Waterproof Flexible Cool White DC 12V 5M 3528 SMD 300 Leds LED Strip Light CAR | eBay
I'll throw in a pic of my 94 Runner. hope this helps