I never bought a connector for the MC-8 but I am rather sure that it
is a SUMICON 1600.
I think you have to order the following items (2 each for a cable)
P-1660A-CA(50) -> Plug cover
P-1660A-STA(51) -> stopper bracket
P-1660BA-STA(50) -> connector
But I am not completely sure - so it is a good idea to try to contact
a Hirose distributor again