Their cover cases (shells) are followings.
1612-CBA(51)(8 contacts ~ 16 contacts)(Scheduled to be discontinued)
P-1612A-C(50)(8 contacts ~ 60 contacts)
On the other side, a stopper is required so that the lock functions at the time of mating.
The stopper is 1600-STB(05)(Scheduled to be discontinued) for 1612-CBA(51)(Scheduled to be discontinued) and
the stopper is P-1612A-ST(51) for P-1612A-C(50).