Just found an old motorcycle magazine article which confirmed what I was thinking was true. James R. Birmingham inventor of record for Patent No. 3957930 was the principle of POSA Enterprises Inc. POSA Enterprises seems to have actually started business making aftermarket parts for the early customizing scene.
Besides motorcycles the POSA Fuel was used on a great many light airplanes using various engines to include modified VW engines. From what I can tell most people hate the things or love them; doesn’t seem to be any in between.
I still want to find and try one on the JAP Privateer.