I just bought an older 2003 Explorer and I want to fix it up to "today's" standards. I am about to buy a Clarion NX702 in dash navigation / satellite radio / etc etc. Well this unit does not have a volume knob that I really like. So I would like to connect it to steering wheel controls. HOWVER, my explorer does NOT currently have steering wheel controls. So what are my options as far as replacing the steering wheel with one with controls? Thanks!