[jc_braconi]

Hello Gunnar,

Yes you can use the first one, just unscrew the little screw which is on the flange the one we see on the picture, let a drop of penetrating oil on the head for a while before, next you can use a rear cap to unscrew the M flange and next after cleaning the thread with lighter fluid and using some moly grease you can use it on a LTM body.
The one for M3 is useable too, but you do not to use it

Good luck
(you are lucky anyway)