04-10-2016, 08:22 AM
If it's not marked, if you look at the inner part (with the springs, not the friction material) you'll see that one side is shallower than the other - the shallow side faces the flywheel, the deeper side faces the pressure plate.
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate