I am trying to figure out which type of Defogger sw. my 1980 has installed (or should have). The vin for my car has it being built in nov of 79. Would this be considered Early 80 or Late 80? The switch currently installed has 3 straight contacts in a row with a fourth contact parallel to the 3 contacts about 1/4" apart from the row of 3. The early version of this system should have a switch and a relay. The late version just has a switch and no relay. I might need to change out my rear light harness and knowing which version should be installed would be of great help, as the harness is different for the two installations. Also, does anyone know where to obtain these switches? It looks like they are a wee bit hard to come by.