Sony wiring harness
 

That is typically the way radios come. The head unit comes supplied with the connector that goes into the back with dead-ended wires. You then go out and buy the vehicle specific connector (white connector in picture) that matches the radio which also has loose wires. Then then get spliced together.

Those splices do not look like a mess. Appears as if there are crimp connectors under the heat shrink. I'd call that good. I do not think you will find a specific Jeep to Sony connector that doesn't require splicing.

Were you having problems that led to you wanting to replace this?

Be thankful the previous owner used a wired connector and did not cut all the wires to stock connector. If there are no issues you can wrap that section in wire loom to keep wires contained and hide the 'mess'.

They were available back in like 2006. I had one i purchased for a zj. I think it was from a best buy at a nearby mall. They did installations there and I walked into the shop where they did the installs and questioned them on it and they actually had some there .If anywhere would have them now it would be either crutchfeild amazon or Ebay.