David, your Rear Back plates are identical to my 57 Spider Veloce.
Emergency Brake is cable activated by the Arm (separate part) next to the Slave Cylinder.
Make sure the whole cylinder/arm assembly is able to slide back and forth otherwise locked brakes are the result.
1957 Spider Veloce
IN VINO VERITAS
Last edited by ubach; 01-23-2019 at 04:58 PM.