Mister Allen Brown, you are a great man ! Thanks a lot for your explanation !
So for LM3 the problem is now why SG lola 781 in 1979
http://img179.imageshack.us/my.php?i...hoto067wz7.jpg
or SLG 781 in 1980
http://img218.imageshack.us/my.php?i...to066ooit4.jpg