Bruce S asked if Command’s LED upgrade kit would fit a Bargman 30-92-XXX surface mount tail light or what options were available.

Your options are a bit limited.  Bargman does not currently offer an LED upgrade for this light and I cannot recommend the "bulb" type replacement LEDs as these are often not bright enough and the optics of the standard lens are not designed to meet DOT requirements with LEDs.

I would suggest that you look at our 003-81BM1 and 003-81LBM1 (black base) or the 003-81M1 & 003-81LM1 (white base).  These are a bit wider than your Bargman lights but not as tall.  This would expose two of the mounting holes below the lights, but on the driver's side the extra holes would be covered by the license plate. In any case, all unused holes should still be sealed, of course.  You might be able to easily fill these with just a small bit of RTV silicone adhesive.

If you choose to replace your lights with the Command model 003-81’s in LED, I personally prefer the black base version as I think it looks much richer.  Only a small bit of the base is visible around the light, I doubt anyone would notice the black base vs the white base you probably have now.  Take a look at the pictures here:

http://www.commandelectronics.com/led-tail-lights.html