I purchased a full screen headunit with gps after seller confirmed it would fit my 2012 xv that has just basic cd/radio. The connectors dont match up, shoild i return this or can anything be done?

you might be able to get a loom adapter, will any of these fit the connectors you have behind the console?

https://www.dynamicsounds.co.uk/subaru-steering-wheel-interface-adaptors.html

Alot of units have different connectors and will need an addaptor as jay has said/linked. Find the right one and plug it in and job should be a fish.