Any standard conical thread release should work, provided the release socket on the top right of the lens panel still has the threaded section. I have seen a couple with this bit missing.
The only gotcha with the Mamiya - and the C33/C220 design of release is less prone to the problem - is a release that does not fully retract. The shutter release is also the film advance stop, and a partially extended cable release can trip the film stop and the camera just keeps winding. The short-wind off feature can be useful, but not when it happens by accident.