It definitely is the Doubles SF from the French Pro 1968 (July 9-15).
But I have 5/3 third set before Roche retired.
This tournament arguably had a better draw than the open RG for top players like Newcombe were unable to play that one, mainly because of the event of "May 68".
It was the last year this tournament was held. The previous 4 or 5 years, it was held at Coubertin on indoor wood.