If you buy a momo (or similar) boss, then the lifeline Group N (at the bottom of the link below) quick release boss will bolt to it. All you'll need to do then is get an adaptor machined to fit between the RS steering wheel (which is IIRC a 6 bolt fitting on a 76mm PCD) and the lifeline hub (which is 6 bolt fitting on 70mm PCD)

http://www.lifeline-fire.co.uk/downl...ec%20sheet.pdf