DeeRoc, I smiled and chuckled when I saw your request...LOVE IT! Hey, I still have a 3/4" lug on my second high power bird from the 90's! ...and 3/8" lugs on my L1/L2 bird from the same timeframe...though they were brass.
On a source note, I believe Semroc has or had something in that size range. I recall them at one time...maybe coming with the clone kit for the original Mark II. It was a thick wall big lug...larger than 1/4", smaller than 1/2". Let me search a bit...