In the Wheels used in Trans-Am thread there are some pics on page 5, I believe. They show a Minilite wheel with TPI stamped on it, which is thought to be Troy Promotions (Thompson/DeLorenzo team). Those wheels do not have the machined center like what is seen in the article. I think the machined center is an owner modification, not something Minilite did.
Ron Lathrop took several pictures that show the Minilites in detail, one such place is in the Michigan Wolverine Trans-Am of 1969.