I have a Volvo S80 Se D5 Auto. It 'had' a HU-850 fitted with the under seat Amp, and central speaker. The issue is the stereo didn't work from when i got the car. I have bought the cage and facia to fit a double din stereo. The replacement is a Pioneer with standard ISO harness. Coming out of where my stereo was i have as pictured. I dont really mind about not have radio or controls from the steering wheel i just want some noise when i am driving. I am based in the UK, can anyone provide links to what adaptors i need to buy to fit the replacement stereo and ideally some instructions.

Thanks in advance