And your best guess

I have a leftover set of 1.5 ratio CAT rockers. They have the same adjusters you speak of. I would highly recommend better adjusting screws. I believe they are bushed, yes? As others have already stated CAT used to be their own company. Hughes used to be a distributor for Cat. The H beams in my 408 kit from Hughes were CAT. It was decent stuff for the money, at the time. I have never mocked the rockers to see how close geometry is.