Unfortunately, I don't have much more info on them. This was a long time back. Steve was buying the disks in quantity directly from Supertrapp, but they were quoting really high prices to ship to him, so he asked me if he could have them sent to me, and I could then ship them to him. I had been supplying him with JE pistons for many years by then, and he had noted that my shipping costs were much less than Supertrapp wanted. I shipped two or three large boxes of parts from Supertrapp to him over a several year period. But I don't recall the exact contents, except for multiple packs of the diffuser disks, and I don't recall what was on the invoices that came with them. I never did see a picture of how he fitted them to his silencers. I don't recall ever seeing them listed on his web site. I think he just supplied them to his existing customers as needed. He may have made the end cap to hold them himself, and just used the diffuser disk, base, and cover from Supertrapp. If I recall correctly, he used the 3" disks, not the 4" or 5" ones, but I can't be positive.
Ken