The manual in the top pic should be the same as the similar one in the bottom pic, but the top one is much thicker (about half an inch). If you get a reprint of the Helms manual, they split it into two. I don't have them, so don't know how thick they are.
I'm missing the '88 Fiero Product book, the '88 Fiero color chart, the '88 Fiero DIY manual, and whatever supplementals. I like to have all the stuff.
Somewhere, I have some various Hot Rod and things magazines with Fiero articles. Those are probably in the library.