I have also seen the same dome light in large earlier Dodge flat bed trucks perhaps 1937 - 1938 . If that backing that holds the glass is too rusted , let me know as I might have that too . When installing the dome light you will need four spacers on the corners about 1/8 " thick , this holds the housing away from the headliner so that the bezel has room to snap in place . The original spacers were leather and had the shape of flat faucet washers . If you happen to drill a hole in your ABS headliner in the wrong spot , Use a hole punch in a scrap of material to make a round plug for a patch . I think the later years of the 1939 - 1947 trucks had the internal switch , they all used the same glass though . There has been a lens and chrome bezel on ebay recently but I think the guy wanted too much $ . If you post your photo on the Pilot House side someone might have it in chrome .