I also started a thread like this severeal years ago. I wanted to make my own straps using webbing. I had a fleet of 25 RBs, all I neeeded were the lugs. I wound up buying OpTech straps, never fdound a source for lugs.
The OpTech straps aren't my choice but were cheap at teh time I bought em. I still don't care for em much. I'd rather have a strap that slides over my clothes easily instread of that grippy material they use. Nothing Like the good old leather Mamiya straps!