In looking at our existing fogs, it does appear it is a round light (reflector & bulb area) in a housing that matches the non-round opening. The non-round glass area is flush with the outside surface and the round area is set back several inches. I could see possibly mounting a round fog to the back of the housing. The glass would be back at the round hole not flush with the outside surface. Is that what TRS is talking about or are they talking about glass flush with the front surface? Would still like to see some pics.