I bought my Haynes directly from Haynes in jolly ole England.But this manual is more for serious beginners who may not know a gaiter from a croc or even a 11 mm wrench from a 7/16 spanner..
If you dig some you will find excellent sections of a "manual" on this site and easily linked sites...
Go to the Sticky FAQs in the beginning of this section.
Sorry, no Bentley, do not know about Helms.
Check eEuroparts, PartsforSaabs, and Google
The Haynes is printed on inexpensive rather fragile paper, is OK in some aspects, poor in others.
The '94 to '98 900 4 cylinder only is covered, and its the English model to boot(favors the lefty ??)...