Only the central gearboxes are available for these mechanisms now but usually this is the part that fails and needs replacing.
All these Fullex gearboxes are basically the same, the only differences are the features of the fixing plate. See the drawings (below) for details of the different centre case designs. Only case type A is available now, the other Fullex cases have been discontinued.
Click here to view suitable lever/lever handles.
Click here to view suitable lever/pad handles.
Please check that these handles cover any existing screw holes in the door.