It looks like InCarTec has what you need. Your car plug matches perfectly with a few harnesses they have. Their harness with Nissan 20 pin radio replacement ISO adapter cable and steering control interface is their part number 49-671
https://incartec.co.uk/product/Nissan-2 ... ace-49-671 Their harness with Nissan 20 pin radio replacement ISO adapter cable (no steering controls) is their part number 20-163
https://incartec.co.uk/product/Nissan-C ... o-ISO-lead Their harness with Nissan 20 pin car radio replacement ISO steering wheel control cable (loose wire connections) is their part number 20-163-SWC
https://incartec.co.uk/product/Nissan-2 ... 20-163-SWC
Each of these harnesses have the same 20 pin connector that fits your car's plug. The differences are how you intend to attach other features, like your steering wheel controls is you have that and want that connectivity, as well as how the head unit connections are made. As for that Golamimo head unit, I have no idea if tour Nissan OEM camera is going to work with it. I think it should but I really have no idea since I can find no access to its technical specs. I'm clueless regarding the audio tech stuff with your speakers, the CD changer and sat-nav. I hope you can get it all sorted out. I know this Nissan 20 pin connector should help. Good luck.