I had spoke with Jim Inglese about a year ago and he said they were avail thru him.
From his website:
So why are There Two "Inglese" Companies?
There's a lot of confusion about INGLESE INDUCTION SYSTEMS vs. JIM INGLESE 8-STACK SYSTEMS, and I'm really sorry about all that. They're actually two separate companies that are in no way connected. I know everybody wonders how this can be.
INGLESE INDUCTION SYSTEMS was my original company, founded in 1980. I sold that company a long time ago and then I came back into it under my own name as JIM INGLESE EIGHT STACK SYSTEMS. The original company, INGLESE INDUCTION SYSTEMS, was owned by Comp Cams in Tennessee, and our two companies, while sharing the name, were never affiliated. Today, that company (INGLESE INDUCTION SYSTEMS) is no longer in business. Now it's just me again, Jim Inglese Eight-Stack Systems, and there is much less confusion.
https://www.jiminglese.com