It's a real stretch to link the 917 to the 962, but you could go as far as 936, which did share some componentry. Prior to Jochen Dauer's 962 road cars (which, as GTs, won Le Mans again, but now as 'road cars converted for racing' (mad)), Aussie Vern Schuppan did a few of his own. IIRC his first road car was displayed at the 1991 Le Mans 24 Hours, when genuine 962 Group C racers were still competing.
It's often forgotten that Dauer competed in Group C with his own 962, prior to getting the idea for making them in to road cars.