There have been many changes in ring design since that manual was published, so its information is somewhat obsolete. Early oil rings were single-piece castings, which were later replaced by multi-piece steel rings. The oil ring setup with a spacer behind the expander was found to be an unnecessarily complicated design, and it was phased out. Just be sure to stagger the ends of all the pieces, and don't let the ends of the expander overlap as you're installing the scraper rails, and you'll be in good shape.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!