Don't think you'll find an aftermarket one that is a direct fit so will need to get a single DIN and a facia plate to suit.
Here is the results (I hope) or a youtube search on the topic -->
https://www.youtube.com/results?q=kj...stereo+install which will likely include parts used.
I have read around the place of one or two double DIN installs as well but not that many.
There is a Pioneer DEH-X4750BT and Pioneers speakers in in our KJ but it was put in by the PO so no idea how easy (or not) it is to do. No steering wheel controls tho which is a bummer but other than that it works as it should and plays the tunes