Someone forgot how they took it apart. 
For the front, put harness (and grommet) through hole in back of housing. Push/pull grommet into place. Pull harness through until reflector is in place.
Work bezel clamp ring over housing (making damn sure you don't scratch the fresh powder-coating).
Rotate clap ring so that the screws go on bottom, and can be tightened from outside (ie. one left, one right).
Clear as pond water, right?
For the front, put harness (and grommet) through hole in back of housing. Push/pull grommet into place. Pull harness through until reflector is in place.
Work bezel clamp ring over housing (making damn sure you don't scratch the fresh powder-coating).
Rotate clap ring so that the screws go on bottom, and can be tightened from outside (ie. one left, one right).
Clear as pond water, right?