Just checking on an area where I can get a proper wire adapter, kit for a new car stereo

 

Maybe Crutchfield's?

 

Here it is. This one has the Land Rover amp connection which you’ll need to connect if you have the factory amp (or the radio won’t work). It comes with a bonus trim piece to replace the original that can break during installation. I used this kit and my radio upgrade works fine.

Harness