Single din & steering wheel controls

only if the head unit supports the steering controls, you will probably need a loom for the radio specific to that brand and then another box of tricks to connect it to the steering wheel.

Have a look at www.caraudiodirect.com

Most modern day units support the steering wheel controls feature , it just plugs into the canbus adaptor.
i got all my stuff here : www.incarexpress.co.uk/