the restaurant is amongst that lot and is marked on the map as "Les Hunaudieres
Sorry - that isn't awfully helpful, is wrong and apologies for being lazy and relying on decaying brain cells. The map is here:
http://www.clubarnage.com/images/lmcolour1.jpgFollow the Mulsanne down from Tetre Rouge until you see group of buildings called "Le Camp" the groupo on the ouside of the circuit is the restaurant area - look to the east (right) and you'll see the parallel-ish road a kilometre or so away that the gendarmes divert you down - look for La Chesnaire and Le Gue and those are the roads that lead you down to the restaurant area