Hey Joe...steal away....it was a 2-1/2" Sure Pop...toss the guts...I haven't figured out what to do with them.....yet!
I mentioned to Cletis earlier, that if you wanted something to fit entirely inside the rail..you could use a chuck of aluminum tube.....a 3" piece of boat seat extension tube could be rounded on the end....polished up....a couple of fat 1-1/4"OD "O" rings inside the tube to hold the plastic lens...might not be quite so obvious.
Have at it.....but you gotta send me a picture of it flashing. It took me more time to trigger my camera when both turn signals were lit than to make the light!!!!! lolololol
Dave