The web page support.apple.com/kb/HT1380 indicates adapter #9 for the current model ipod classic 160GB is included when you buy the Apple Universal Dock. It shows six adapters being included. The other five were in the box of the dock I purchased. What gives? Especially interesting since all other current Apple products with a 30-pin plug seem to fit the five included adapters. Is the ipod classic 160GB a second class citizen? Shouldn't all current products be included - JUST AS THE WEB PAGE SHOWS?
I can now answer my own question. The adapter was in the bottom of the box of the current ipod classic 160GB itself. Apple needs to modify support.apple.com/kb/HT1380 accoringly with a different footnote on adapter #9 at least for the ipod classic 160 GB late 2009.