Ok, so I have some NOS Grote Par 46 light head housings, Par 46 bulbs and Julian McDermott Par 46 lenses... however, the filters make it too thick for the outer ring to fit onto the light housing. This is the same combination that CHP used in the 70's and 80's so I am not sure why I can't get it to all fit together. Does anyone know if CHP had to modify something to get all of the components to fit together??