They are LP Type IV flushmounts, small size. I had the bodywork modified by Morse Fiberglass while they were repairing/painting everything from a lowside last year. They shaved the stock mounting recesses and filled the gap in, then drilled a hole to mount the new signals.

LP makes a size big enough to cover the stock recess I think, check on their site. I liked the look of the small ones a bit better and figured I'd make the change while the bodywork was getting redone anyway.