Stereo Identification

Hi there
New to the club as just got my first micra Dci sport+ and so far all is well with the car.
The problem i have is i want to fit an original stereo back to the car so I can use the steering wheel controls as the owner before me decided to put a cheap aftermarket one in.
Does anyone know how I can find out which should be the correct one for my car as there seems to be a few types of stereo out there.
Any help would be grateful.
 
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