18-01-2016, 07:05 PM
From memory I think the larger one is M12 x 1 thread, but don't go ordering anything based solely on that!
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate