How long were the bumper to bumper and powertrain warranties offered for these two model years?

Did these model years get the 1 year 10,000 extension?

the powertrain got extended 1yr/10k miles, not bumper-to-bumper.

Does that basically mean all RX8's on the road have or had at one point a 5 year 60,000 mi powertrain warranty?

Is bumper to bumper 40,000 mi?

Read your Manual.

Is there a manual available online?

'04-'05 RX-8s have 4 year/50,000 mile bumper-to-bumper warranty, and a 5 year/60,000 mile powertrain warranty after the recall/warranty extension.

Is there a manual available online?
http://www.mazdausa.com/MusaWeb/displayOwnersHome.action

Also, all newer cars have a mandated 100k emissions equipment warranty. I beleive the time limit is 10 or 15 years on that. Keep that in mind as your car ages as the cat on the rx8 is a sore spot and expensive.