Geoff- Yes, this is the manual you want. While the title may be confusing, the manual does cover the 80 and 90 as well as the quattro versions of both. It's thicker than the Manhattan Yellow Pages! How do I know? I bought it from amazon.com about a month ago! It 'only' cost me $101.00 though, not the $144.95 that you were quoted. Good luck, Enjoy!