Diameter of Mamiya Press 50mm rear cell?

Will the rear cell of the Mamita Press 50mm f/6.3 fit through a 50mm hole? I know it’s a Biogon design and the front is large (72mm filters) but I can’t find any info on the rear.

mine (which is transplanted into a Copal #0 shutter) has a 45.5mm rear so it should fit.