22-09-2014, 04:32 PM
Im pretty sure there is 2 different sizes between the 2/3 you have on the thermostat housing however the majority are M12.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft